From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brian Delwiche <delwiche@google.com>
Date: Thu, 25 Aug 2022 18:52:28 +0000
Subject: [PATCH] RESTRICT AUTOMERGE Added max buffer length check

Bug: 230867224
Test: Manual -- paired Bluetooth headset and played audio
Tags: #security
Ignore-AOSP-First: Security
Change-Id: I740038288143715a1c06db781efd674b269a7f3e
(cherry picked from commit 769f55450bd2eb94ddb9080f730e404de7716bda)
Merged-In: I740038288143715a1c06db781efd674b269a7f3e
---
 stack/avct/avct_lcb_act.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/stack/avct/avct_lcb_act.cc b/stack/avct/avct_lcb_act.cc
index e2ce9db42..35f9bc60a 100644
--- a/stack/avct/avct_lcb_act.cc
+++ b/stack/avct/avct_lcb_act.cc
@@ -30,6 +30,7 @@
 #include "bt_types.h"
 #include "bt_utils.h"
 #include "btm_api.h"
+#include "osi/include/log.h"
 #include "osi/include/osi.h"
 
 /* packet header length lookup table */
@@ -58,7 +59,12 @@ static BT_HDR* avct_lcb_msg_asmbl(tAVCT_LCB* p_lcb, BT_HDR* p_buf) {
   pkt_type = AVCT_PKT_TYPE(p);
 
   /* quick sanity check on length */
-  if (p_buf->len < avct_lcb_pkt_type_len[pkt_type]) {
+  if (p_buf->len < avct_lcb_pkt_type_len[pkt_type] ||
+      (sizeof(BT_HDR) + p_buf->offset + p_buf->len) > BT_DEFAULT_BUFFER_SIZE) {
+    if ((sizeof(BT_HDR) + p_buf->offset + p_buf->len) >
+        BT_DEFAULT_BUFFER_SIZE) {
+      android_errorWriteWithInfoLog(0x534e4554, "230867224", -1, NULL, 0);
+    }
     osi_free(p_buf);
     AVCT_TRACE_WARNING("Bad length during reassembly");
     p_ret = NULL;