From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brian Delwiche <delwiche@google.com>
Date: Tue, 27 Sep 2022 22:05:08 +0000
Subject: [PATCH] Add bounds check in avdt_scb_act.cc

Bug: 242535997
Test: BT unit tests, validated against researcher POC
Tag: #security
Ignore-AOSP-First: Security
Change-Id: I3b982e5d447cb98ad269b3da3d7d591819b2e4e4
(cherry picked from commit eca4a3cdb0da240496341f546a57397434ec85dd)
Merged-In: I3b982e5d447cb98ad269b3da3d7d591819b2e4e4
---
 stack/avdt/avdt_scb_act.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/stack/avdt/avdt_scb_act.cc b/stack/avdt/avdt_scb_act.cc
index 31745bb2f..ce53c45eb 100644
--- a/stack/avdt/avdt_scb_act.cc
+++ b/stack/avdt/avdt_scb_act.cc
@@ -977,6 +977,11 @@ void avdt_scb_hdl_write_req(AvdtpScb* p_scb, tAVDT_SCB_EVT* p_data) {
 
   /* Build a media packet, and add an RTP header if required. */
   if (add_rtp_header) {
+    if (p_data->apiwrite.p_buf->offset < AVDT_MEDIA_HDR_SIZE) {
+      android_errorWriteWithInfoLog(0x534e4554, "242535997", -1, NULL, 0);
+      return;
+    }
+
     ssrc = avdt_scb_gen_ssrc(p_scb);
 
     p_data->apiwrite.p_buf->len += AVDT_MEDIA_HDR_SIZE;