提交: ae9562805e14540bdd41c271c5248e751d8c4b9c - system-bt (git)

system/bt

Commit MetaInfo

• 修订版: ae9562805e14540bdd41c271c5248e751d8c4b9c (tree)
• 时间: 2019-01-08 17:16:56
• 作者: Chih-Wei Huang <cwhuang@linu...>
• Commiter: Chih-Wei Huang

Log Message

Android 8.1.0 Release 60 (OPM8.190105.002)
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Merge tag 'android-8.1.0_r60' into oreo-x86

Android 8.1.0 Release 60 (OPM8.190105.002)

更改概述

• modified: bta/ag/bta_ag_act.cc
• modified: bta/ag/bta_ag_at.cc
• modified: bta/ag/bta_ag_at.h
• modified: bta/ag/bta_ag_cmd.cc
• modified: bta/ag/bta_ag_int.h
• modified: bta/hh/bta_hh_act.cc
• modified: stack/avdt/avdt_scb_act.cc
• modified: stack/mcap/mca_cact.cc
• modified: stack/sdp/sdp_discovery.cc

差异

--- a/bta/ag/bta_ag_act.cc
+++ b/bta/ag/bta_ag_act.cc
@@ -58,7 +58,7 @@ const tBTA_SERVICE_MASK bta_ag_svc_mask[BTA_AG_NUM_IDX] = {
     BTA_HSP_SERVICE_MASK, BTA_HFP_SERVICE_MASK};
 
 typedef void (*tBTA_AG_ATCMD_CBACK)(tBTA_AG_SCB* p_scb, uint16_t cmd,
-                                    uint8_t arg_type, char* p_arg,
+                                    uint8_t arg_type, char* p_arg, char* p_end,
                                     int16_t int_arg);
 
 const tBTA_AG_ATCMD_CBACK bta_ag_at_cback_tbl[BTA_AG_NUM_IDX] = {

--- a/bta/ag/bta_ag_at.cc
+++ b/bta/ag/bta_ag_at.cc
@@ -26,6 +26,7 @@
 
 #include "bt_common.h"
 #include "bta_ag_at.h"
+#include "log/log.h"
 #include "utl.h"
 
 /*****************************************************************************
@@ -76,7 +77,7 @@ void bta_ag_at_reinit(tBTA_AG_AT_CB* p_cb) {
  * Returns          void
  *
  *****************************************************************************/
-void bta_ag_process_at(tBTA_AG_AT_CB* p_cb) {
+void bta_ag_process_at(tBTA_AG_AT_CB* p_cb, char* p_end) {
   uint16_t idx;
   uint8_t arg_type;
   char* p_arg;
@@ -92,6 +93,11 @@ void bta_ag_process_at(tBTA_AG_AT_CB* p_cb) {
   if (p_cb->p_at_tbl[idx].p_cmd[0] != 0) {
     /* start of argument is p + strlen matching command */
     p_arg = p_cb->p_cmd_buf + strlen(p_cb->p_at_tbl[idx].p_cmd);
+    if (p_arg > p_end) {
+      (*p_cb->p_err_cback)(p_cb->p_user, false, NULL);
+      android_errorWriteLog(0x534e4554, "112860487");
+      return;
+    }
 
     /* if no argument */
     if (p_arg[0] == 0) {
@@ -132,11 +138,11 @@ void bta_ag_process_at(tBTA_AG_AT_CB* p_cb) {
           (*p_cb->p_err_cback)(p_cb->p_user, false, NULL);
         } else {
           (*p_cb->p_cmd_cback)(p_cb->p_user, p_cb->p_at_tbl[idx].command_id,
-                               arg_type, p_arg, int_arg);
+                               arg_type, p_arg, p_end, int_arg);
         }
       } else {
         (*p_cb->p_cmd_cback)(p_cb->p_user, p_cb->p_at_tbl[idx].command_id,
-                             arg_type, p_arg, int_arg);
+                             arg_type, p_arg, p_end, int_arg);
       }
     }
     /* else error */
@@ -187,8 +193,9 @@ void bta_ag_at_parse(tBTA_AG_AT_CB* p_cb, char* p_buf, uint16_t len) {
             (p_cb->p_cmd_buf[0] == 'A' || p_cb->p_cmd_buf[0] == 'a') &&
             (p_cb->p_cmd_buf[1] == 'T' || p_cb->p_cmd_buf[1] == 't')) {
           p_save = p_cb->p_cmd_buf;
+          char* p_end = p_cb->p_cmd_buf + p_cb->cmd_pos;
           p_cb->p_cmd_buf += 2;
-          bta_ag_process_at(p_cb);
+          bta_ag_process_at(p_cb, p_end);
           p_cb->p_cmd_buf = p_save;
         }
 

--- a/bta/ag/bta_ag_at.h
+++ b/bta/ag/bta_ag_at.h
@@ -55,7 +55,7 @@ typedef struct {
 
 /* callback function executed when command is parsed */
 typedef void(tBTA_AG_AT_CMD_CBACK)(void* p_user, uint16_t command_id,
-                                   uint8_t arg_type, char* p_arg,
+                                   uint8_t arg_type, char* p_arg, char* p_end,
                                    int16_t int_arg);
 
 /* callback function executed to send "ERROR" result code */

--- a/bta/ag/bta_ag_cmd.cc
+++ b/bta/ag/bta_ag_cmd.cc
@@ -30,6 +30,7 @@
 #include "bta_ag_int.h"
 #include "bta_api.h"
 #include "bta_sys.h"
+#include "log/log.h"
 #include "osi/include/log.h"
 #include "osi/include/osi.h"
 #include "port_api.h"
@@ -378,23 +379,23 @@ static void bta_ag_send_ind(tBTA_AG_SCB* p_scb, uint16_t id, uint16_t value,
  * Returns          true if parsed ok, false otherwise.
  *
  ******************************************************************************/
-static bool bta_ag_parse_cmer(char* p_s, bool* p_enabled) {
+static bool bta_ag_parse_cmer(char* p_s, char* p_end, bool* p_enabled) {
   int16_t n[4] = {-1, -1, -1, -1};
   int i;
   char* p;
 
-  for (i = 0; i < 4; i++) {
+  for (i = 0; i < 4; i++, p_s = p + 1) {
     /* skip to comma delimiter */
-    for (p = p_s; *p != ',' && *p != 0; p++)
+    for (p = p_s; p < p_end && *p != ',' && *p != 0; p++)
       ;
 
     /* get integer value */
+    if (p > p_end) {
+      android_errorWriteLog(0x534e4554, "112860487");
+      return false;
+    }
     *p = 0;
     n[i] = utl_str2int(p_s);
-    p_s = p + 1;
-    if (p_s == 0) {
-      break;
-    }
   }
 
   /* process values */
@@ -452,7 +453,8 @@ static uint8_t bta_ag_parse_chld(UNUSED_ATTR tBTA_AG_SCB* p_scb, char* p_s) {
  * Returns          Returns bitmap of supported codecs.
  *
  ******************************************************************************/
-static tBTA_AG_PEER_CODEC bta_ag_parse_bac(tBTA_AG_SCB* p_scb, char* p_s) {
+static tBTA_AG_PEER_CODEC bta_ag_parse_bac(tBTA_AG_SCB* p_scb, char* p_s,
+                                           char* p_end) {
   tBTA_AG_PEER_CODEC retval = BTA_AG_CODEC_NONE;
   uint16_t uuid_codec;
   bool cont = false; /* Continue processing */
@@ -460,10 +462,14 @@ static tBTA_AG_PEER_CODEC bta_ag_parse_bac(tBTA_AG_SCB* p_scb, char* p_s) {
 
   while (p_s) {
     /* skip to comma delimiter */
-    for (p = p_s; *p != ',' && *p != 0; p++)
+    for (p = p_s; p < p_end && *p != ',' && *p != 0; p++)
       ;
 
     /* get integre value */
+    if (p > p_end) {
+      android_errorWriteLog(0x534e4554, "112860487");
+      break;
+    }
     if (*p != 0) {
       *p = 0;
       cont = true;
@@ -597,7 +603,8 @@ void bta_ag_send_call_inds(tBTA_AG_SCB* p_scb, tBTA_AG_RES result) {
  *
  ******************************************************************************/
 void bta_ag_at_hsp_cback(tBTA_AG_SCB* p_scb, uint16_t command_id,
-                         uint8_t arg_type, char* p_arg, int16_t int_arg) {
+                         uint8_t arg_type, char* p_arg, char* p_end,
+                         int16_t int_arg) {
   APPL_TRACE_DEBUG("AT cmd:%d arg_type:%d arg:%d arg:%s", command_id, arg_type,
                    int_arg, p_arg);
 
@@ -607,6 +614,13 @@ void bta_ag_at_hsp_cback(tBTA_AG_SCB* p_scb, uint16_t command_id,
   val.hdr.handle = bta_ag_scb_to_idx(p_scb);
   val.hdr.app_id = p_scb->app_id;
   val.num = (uint16_t)int_arg;
+
+  if ((p_end - p_arg + 1) >= (long)sizeof(val.str)) {
+    APPL_TRACE_ERROR("%s: p_arg is too long, send error and return", __func__);
+    bta_ag_send_error(p_scb, BTA_AG_ERR_TEXT_TOO_LONG);
+    android_errorWriteLog(0x534e4554, "112860487");
+    return;
+  }
   strlcpy(val.str, p_arg, sizeof(val.str));
 
   /* call callback with event */
@@ -836,7 +850,7 @@ static bool bta_ag_parse_biev_response(tBTA_AG_SCB* p_scb, tBTA_AG_VAL* val) {
  *
  ******************************************************************************/
 void bta_ag_at_hfp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd, uint8_t arg_type,
-                         char* p_arg, int16_t int_arg) {
+                         char* p_arg, char* p_end, int16_t int_arg) {
   tBTA_AG_VAL val;
   tBTA_AG_SCB* ag_scb;
   uint32_t i, ind_id;
@@ -856,6 +870,13 @@ void bta_ag_at_hfp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd, uint8_t arg_type,
   val.hdr.status = BTA_AG_SUCCESS;
   val.num = int_arg;
   val.bd_addr = p_scb->peer_addr;
+
+  if ((p_end - p_arg + 1) >= (long)sizeof(val.str)) {
+    APPL_TRACE_ERROR("%s: p_arg is too long, send error and return", __func__);
+    bta_ag_send_error(p_scb, BTA_AG_ERR_TEXT_TOO_LONG);
+    android_errorWriteLog(0x534e4554, "112860487");
+    return;
+  }
   strlcpy(val.str, p_arg, sizeof(val.str));
 
   /**
@@ -1034,7 +1055,7 @@ void bta_ag_at_hfp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd, uint8_t arg_type,
 
     case BTA_AG_LOCAL_EVT_CMER:
       /* if parsed ok store setting, send OK */
-      if (bta_ag_parse_cmer(p_arg, &p_scb->cmer_enabled)) {
+      if (bta_ag_parse_cmer(p_arg, p_end, &p_scb->cmer_enabled)) {
         bta_ag_send_ok(p_scb);
 
         /* if service level conn. not already open and our features and
@@ -1195,7 +1216,7 @@ void bta_ag_at_hfp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd, uint8_t arg_type,
       /* store available codecs from the peer */
       if ((p_scb->peer_features & BTA_AG_PEER_FEAT_CODEC) &&
           (p_scb->features & BTA_AG_FEAT_CODEC)) {
-        p_scb->peer_codecs = bta_ag_parse_bac(p_scb, p_arg);
+        p_scb->peer_codecs = bta_ag_parse_bac(p_scb, p_arg, p_end);
         p_scb->codec_updated = true;
 
         if (p_scb->peer_codecs & BTA_AG_CODEC_MSBC) {

--- a/bta/ag/bta_ag_int.h
+++ b/bta/ag/bta_ag_int.h
@@ -361,9 +361,11 @@ extern void bta_ag_sco_conn_rsp(tBTA_AG_SCB* p_scb,
 
 /* AT command functions */
 extern void bta_ag_at_hsp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd,
-                                uint8_t arg_type, char* p_arg, int16_t int_arg);
+                                uint8_t arg_type, char* p_arg, char* p_end,
+                                int16_t int_arg);
 extern void bta_ag_at_hfp_cback(tBTA_AG_SCB* p_scb, uint16_t cmd,
-                                uint8_t arg_type, char* p_arg, int16_t int_arg);
+                                uint8_t arg_type, char* p_arg, char* p_end,
+                                int16_t int_arg);
 extern void bta_ag_at_err_cback(tBTA_AG_SCB* p_scb, bool unknown, char* p_arg);
 extern bool bta_ag_inband_enabled(tBTA_AG_SCB* p_scb);
 extern void bta_ag_send_call_inds(tBTA_AG_SCB* p_scb, tBTA_AG_RES result);

--- a/bta/hh/bta_hh_act.cc
+++ b/bta/hh/bta_hh_act.cc
@@ -26,6 +26,7 @@
 
 #if (BTA_HH_INCLUDED == TRUE)
 
+#include <log/log.h>
 #include <string.h>
 
 #include "bta_hh_co.h"
@@ -701,6 +702,12 @@ void bta_hh_ctrl_dat_act(tBTA_HH_DEV_CB* p_cb, tBTA_HH_DATA* p_data) {
   APPL_TRACE_DEBUG("Ctrl DATA received w4: event[%s]",
                    bta_hh_get_w4_event(p_cb->w4_evt));
 #endif
+  if (pdata->len == 0) {
+    android_errorWriteLog(0x534e4554, "116108738");
+    p_cb->w4_evt = 0;
+    osi_free_and_reset((void**)&pdata);
+    return;
+  }
   hs_data.status = BTA_HH_OK;
   hs_data.handle = p_cb->hid_handle;
 

--- a/stack/avdt/avdt_scb_act.cc
+++ b/stack/avdt/avdt_scb_act.cc
@@ -23,6 +23,7 @@
  *
  ******************************************************************************/
 
+#include <cutils/log.h>
 #include <string.h>
 #include "a2dp_codec_api.h"
 #include "avdt_api.h"
@@ -231,10 +232,14 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB* p_scb, tAVDT_SCB_EVT* p_data) {
   uint16_t offset;
   uint16_t ex_len;
   uint8_t pad_len = 0;
+  uint16_t len = p_data->p_pkt->len;
 
   p = p_start = (uint8_t*)(p_data->p_pkt + 1) + p_data->p_pkt->offset;
 
   /* parse media packet header */
+  offset = 12;
+  // AVDT_MSG_PRS_OCTET1(1) + AVDT_MSG_PRS_M_PT(1) + UINT16(2) + UINT32(4) + 4
+  if (offset > len) goto length_error;
   AVDT_MSG_PRS_OCTET1(p, o_v, o_p, o_x, o_cc);
   AVDT_MSG_PRS_M_PT(p, m_pt, marker);
   BE_STREAM_TO_UINT16(seq, p);
@@ -242,18 +247,19 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB* p_scb, tAVDT_SCB_EVT* p_data) {
   p += 4;
 
   /* skip over any csrc's in packet */
+  offset += o_cc * 4;
   p += o_cc * 4;
 
   /* check for and skip over extension header */
   if (o_x) {
+    offset += 4;
+    if (offset > len) goto length_error;
     p += 2;
     BE_STREAM_TO_UINT16(ex_len, p);
+    offset += ex_len * 4;
     p += ex_len * 4;
   }
 
-  /* save our new offset */
-  offset = (uint16_t)(p - p_start);
-
   /* adjust length for any padding at end of packet */
   if (o_p) {
     /* padding length in last byte of packet */
@@ -281,6 +287,12 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB* p_scb, tAVDT_SCB_EVT* p_data) {
       osi_free_and_reset((void**)&p_data->p_pkt);
     }
   }
+  return;
+length_error:
+  android_errorWriteLog(0x534e4554, "111450156");
+  AVDT_TRACE_WARNING("%s: hdl packet length %d too short: must be at least %d",
+                     __func__, len, offset);
+  osi_free_and_reset((void**)&p_data->p_pkt);
 }
 
 #if (AVDT_REPORTING == TRUE)
@@ -298,12 +310,21 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
   uint8_t* p_start = p;
   uint32_t ssrc;
   uint8_t o_v, o_p, o_cc;
+  uint16_t min_len = 0;
   AVDT_REPORT_TYPE pt;
   tAVDT_REPORT_DATA report;
 
   AVDT_TRACE_DEBUG("%s", __func__);
   if (p_scb->cs.p_report_cback) {
     /* parse report packet header */
+    min_len += 8;
+    if (min_len > len) {
+      android_errorWriteLog(0x534e4554, "111450156");
+      AVDT_TRACE_WARNING(
+          "%s: hdl packet length %d too short: must be at least %d", __func__,
+          len, min_len);
+      goto avdt_scb_hdl_report_exit;
+    }
     AVDT_MSG_PRS_RPT_OCTET1(p, o_v, o_p, o_cc);
     pt = *p++;
     p += 2;
@@ -311,6 +332,14 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
 
     switch (pt) {
       case AVDT_RTCP_PT_SR: /* the packet type - SR (Sender Report) */
+        min_len += 20;
+        if (min_len > len) {
+          android_errorWriteLog(0x534e4554, "111450156");
+          AVDT_TRACE_WARNING(
+              "%s: hdl packet length %d too short: must be at least %d",
+              __func__, len, min_len);
+          goto avdt_scb_hdl_report_exit;
+        }
         BE_STREAM_TO_UINT32(report.sr.ntp_sec, p);
         BE_STREAM_TO_UINT32(report.sr.ntp_frac, p);
         BE_STREAM_TO_UINT32(report.sr.rtp_time, p);
@@ -319,6 +348,14 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
         break;
 
       case AVDT_RTCP_PT_RR: /* the packet type - RR (Receiver Report) */
+        min_len += 20;
+        if (min_len > len) {
+          android_errorWriteLog(0x534e4554, "111450156");
+          AVDT_TRACE_WARNING(
+              "%s: hdl packet length %d too short: must be at least %d",
+              __func__, len, min_len);
+          goto avdt_scb_hdl_report_exit;
+        }
         report.rr.frag_lost = *p;
         BE_STREAM_TO_UINT32(report.rr.packet_lost, p);
         report.rr.packet_lost &= 0xFFFFFF;
@@ -330,9 +367,25 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
 
       case AVDT_RTCP_PT_SDES: /* the packet type - SDES (Source Description) */
         uint8_t sdes_type;
+        min_len += 1;
+        if (min_len > len) {
+          android_errorWriteLog(0x534e4554, "111450156");
+          AVDT_TRACE_WARNING(
+              "%s: hdl packet length %d too short: must be at least %d",
+              __func__, len, min_len);
+          goto avdt_scb_hdl_report_exit;
+        }
         BE_STREAM_TO_UINT8(sdes_type, p);
         if (sdes_type == AVDT_RTCP_SDES_CNAME) {
           uint8_t name_length;
+          min_len += 1;
+          if (min_len > len) {
+            android_errorWriteLog(0x534e4554, "111450156");
+            AVDT_TRACE_WARNING(
+                "%s: hdl packet length %d too short: must be at least %d",
+                __func__, len, min_len);
+            goto avdt_scb_hdl_report_exit;
+          }
           BE_STREAM_TO_UINT8(name_length, p);
           if (name_length > len - 2 || name_length > AVDT_MAX_CNAME_SIZE) {
             result = AVDT_BAD_PARAMS;
@@ -340,6 +393,13 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
             BE_STREAM_TO_ARRAY(p, &(report.cname[0]), name_length);
           }
         } else {
+          if (min_len + 1 > len) {
+            android_errorWriteLog(0x534e4554, "111450156");
+            AVDT_TRACE_WARNING(
+                "%s: hdl packet length %d too short: must be at least %d",
+                __func__, len, min_len + 2);
+            goto avdt_scb_hdl_report_exit;
+          }
           AVDT_TRACE_WARNING(" - SDES SSRC=0x%08x sc=%d %d len=%d %s", ssrc,
                              o_cc, *p, *(p + 1), p + 2);
           result = AVDT_BUSY;
@@ -354,6 +414,7 @@ uint8_t* avdt_scb_hdl_report(tAVDT_SCB* p_scb, uint8_t* p, uint16_t len) {
     if (result == AVDT_SUCCESS)
       (*p_scb->cs.p_report_cback)(avdt_scb_to_hdl(p_scb), pt, &report);
   }
+avdt_scb_hdl_report_exit:
   p_start += len;
   return p_start;
 }

--- a/stack/mcap/mca_cact.cc
+++ b/stack/mcap/mca_cact.cc
@@ -449,12 +449,23 @@ void mca_ccb_hdl_rsp(tMCA_CCB* p_ccb, tMCA_CCB_EVT* p_data) {
   tMCA_RESULT result = MCA_BAD_HANDLE;
   tMCA_TC_TBL* p_tbl;
 
-  if (p_ccb->p_tx_req) {
+  if (p_pkt->len < sizeof(evt_data.hdr.op_code) +
+                       sizeof(evt_data.rsp.rsp_code) +
+                       sizeof(evt_data.hdr.mdl_id)) {
+    android_errorWriteLog(0x534e4554, "116319076");
+    MCA_TRACE_ERROR("%s: Response packet is too short", __func__);
+  } else if (p_ccb->p_tx_req) {
     /* verify that the received response matches the sent request */
     p = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
     evt_data.hdr.op_code = *p++;
-    if ((evt_data.hdr.op_code == 0) ||
-        ((p_ccb->p_tx_req->op_code + 1) == evt_data.hdr.op_code)) {
+    if ((evt_data.hdr.op_code == MCA_OP_MDL_CREATE_RSP) &&
+        (p_pkt->len <
+         sizeof(evt_data.hdr.op_code) + sizeof(evt_data.rsp.rsp_code) +
+             sizeof(evt_data.hdr.mdl_id) + sizeof(evt_data.create_cfm.cfg))) {
+      android_errorWriteLog(0x534e4554, "116319076");
+      MCA_TRACE_ERROR("%s: MDL Create Response packet is too short", __func__);
+    } else if ((evt_data.hdr.op_code == 0) ||
+               ((p_ccb->p_tx_req->op_code + 1) == evt_data.hdr.op_code)) {
       evt_data.rsp.rsp_code = *p++;
       mca_stop_timer(p_ccb);
       BE_STREAM_TO_UINT16(evt_data.hdr.mdl_id, p);

--- a/stack/sdp/sdp_discovery.cc
+++ b/stack/sdp/sdp_discovery.cc
@@ -53,7 +53,7 @@ static void process_service_search_attr_rsp(tCONN_CB* p_ccb, uint8_t* p_reply,
 static uint8_t* save_attr_seq(tCONN_CB* p_ccb, uint8_t* p, uint8_t* p_msg_end);
 static tSDP_DISC_REC* add_record(tSDP_DISCOVERY_DB* p_db,
                                  const RawAddress& p_bda);
-static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
+static uint8_t* add_attr(uint8_t* p, uint8_t* p_end, tSDP_DISCOVERY_DB* p_db,
                          tSDP_DISC_REC* p_rec, uint16_t attr_id,
                          tSDP_DISC_ATTR* p_parent_attr, uint8_t nest_level);
 
@@ -767,7 +767,7 @@ static uint8_t* save_attr_seq(tCONN_CB* p_ccb, uint8_t* p, uint8_t* p_msg_end) {
     BE_STREAM_TO_UINT16(attr_id, p);
 
     /* Now, add the attribute value */
-    p = add_attr(p, p_ccb->p_db, p_rec, attr_id, NULL, 0);
+    p = add_attr(p, p_seq_end, p_ccb->p_db, p_rec, attr_id, NULL, 0);
 
     if (!p) {
       SDP_TRACE_WARNING("SDP - DB full add_attr");
@@ -827,7 +827,7 @@ tSDP_DISC_REC* add_record(tSDP_DISCOVERY_DB* p_db, const RawAddress& p_bda) {
  * Returns          pointer to next byte in data stream
  *
  ******************************************************************************/
-static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
+static uint8_t* add_attr(uint8_t* p, uint8_t* p_end, tSDP_DISCOVERY_DB* p_db,
                          tSDP_DISC_REC* p_rec, uint16_t attr_id,
                          tSDP_DISC_ATTR* p_parent_attr, uint8_t nest_level) {
   tSDP_DISC_ATTR* p_attr;
@@ -836,7 +836,7 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
   uint16_t attr_type;
   uint16_t id;
   uint8_t type;
-  uint8_t* p_end;
+  uint8_t* p_attr_end;
   uint8_t is_additional_list = nest_level & SDP_ADDITIONAL_LIST_MASK;
 
   nest_level &= ~(SDP_ADDITIONAL_LIST_MASK);
@@ -853,6 +853,13 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
   else
     total_len = sizeof(tSDP_DISC_ATTR);
 
+  p_attr_end = p + attr_len;
+  if (p_attr_end > p_end) {
+    android_errorWriteLog(0x534e4554, "115900043");
+    SDP_TRACE_WARNING("%s: SDP - Attribute length beyond p_end", __func__);
+    return NULL;
+  }
+
   /* Ensure it is a multiple of 4 */
   total_len = (total_len + 3) & ~3;
 
@@ -876,18 +883,17 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
            * sub-attributes */
           p_db->p_free_mem += sizeof(tSDP_DISC_ATTR);
           p_db->mem_free -= sizeof(tSDP_DISC_ATTR);
-          p_end = p + attr_len;
           total_len = 0;
 
           /* SDP_TRACE_DEBUG ("SDP - attr nest level:%d(list)", nest_level); */
           if (nest_level >= MAX_NEST_LEVELS) {
             SDP_TRACE_ERROR("SDP - attr nesting too deep");
-            return (p_end);
+            return p_attr_end;
           }
 
           /* Now, add the list entry */
-          p = add_attr(p, p_db, p_rec, ATTR_ID_PROTOCOL_DESC_LIST, p_attr,
-                       (uint8_t)(nest_level + 1));
+          p = add_attr(p, p_end, p_db, p_rec, ATTR_ID_PROTOCOL_DESC_LIST,
+                       p_attr, (uint8_t)(nest_level + 1));
 
           break;
         }
@@ -946,7 +952,7 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
           break;
         default:
           SDP_TRACE_WARNING("SDP - bad len in UUID attr: %d", attr_len);
-          return (p + attr_len);
+          return p_attr_end;
       }
       break;
 
@@ -956,22 +962,22 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
        * sub-attributes */
       p_db->p_free_mem += sizeof(tSDP_DISC_ATTR);
       p_db->mem_free -= sizeof(tSDP_DISC_ATTR);
-      p_end = p + attr_len;
       total_len = 0;
 
       /* SDP_TRACE_DEBUG ("SDP - attr nest level:%d", nest_level); */
       if (nest_level >= MAX_NEST_LEVELS) {
         SDP_TRACE_ERROR("SDP - attr nesting too deep");
-        return (p_end);
+        return p_attr_end;
       }
       if (is_additional_list != 0 ||
           attr_id == ATTR_ID_ADDITION_PROTO_DESC_LISTS)
         nest_level |= SDP_ADDITIONAL_LIST_MASK;
       /* SDP_TRACE_DEBUG ("SDP - attr nest level:0x%x(finish)", nest_level); */
 
-      while (p < p_end) {
+      while (p < p_attr_end) {
         /* Now, add the list entry */
-        p = add_attr(p, p_db, p_rec, 0, p_attr, (uint8_t)(nest_level + 1));
+        p = add_attr(p, p_end, p_db, p_rec, 0, p_attr,
+                     (uint8_t)(nest_level + 1));
 
         if (!p) return (NULL);
       }
@@ -989,7 +995,7 @@ static uint8_t* add_attr(uint8_t* p, tSDP_DISCOVERY_DB* p_db,
           break;
         default:
           SDP_TRACE_WARNING("SDP - bad len in boolean attr: %d", attr_len);
-          return (p + attr_len);
+          return p_attr_end;
       }
       break;