DivestOS/Patches/LineageOS-16.0/android_system_bt/345917.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Keith Mok <keithmok@google.com>
Date: Tue, 16 Aug 2022 21:41:03 +0000
Subject: [PATCH] Add length check when copy AVDT and AVCT packet

Previous fix for AVDT causing memory leak.
And missing similar fix for AVCT packet.

Bug: 232023771
Test: make
Tag: #security
Ignore-AOSP-First: Security
Merged-In: Ifa8ed1cd9ea118acba78bdfdf6d5861fad254a90
Change-Id: Ifa8ed1cd9ea118acba78bdfdf6d5861fad254a90
(cherry picked from commit a4311b284639bbd2c6c2c72d35d8444d40fb2d12)
Merged-In: Ifa8ed1cd9ea118acba78bdfdf6d5861fad254a90
---
 stack/avct/avct_lcb_act.cc | 8 +++++++-
 stack/avdt/avdt_msg.cc     | 6 ++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/stack/avct/avct_lcb_act.cc b/stack/avct/avct_lcb_act.cc
index 81ae79d63..28f378138 100644
--- a/stack/avct/avct_lcb_act.cc
+++ b/stack/avct/avct_lcb_act.cc
@@ -85,13 +85,19 @@ static BT_HDR* avct_lcb_msg_asmbl(tAVCT_LCB* p_lcb, BT_HDR* p_buf) {
     if (p_lcb->p_rx_msg != NULL)
       AVCT_TRACE_WARNING("Got start during reassembly");
 
-    osi_free(p_lcb->p_rx_msg);
+    osi_free_and_reset((void**)&p_lcb->p_rx_msg);
 
     /*
      * Allocate bigger buffer for reassembly. As lower layers are
      * not aware of possible packet size after reassembly, they
      * would have allocated smaller buffer.
      */
+    if (sizeof(BT_HDR) + p_buf->offset + p_buf->len > BT_DEFAULT_BUFFER_SIZE) {
+      android_errorWriteLog(0x534e4554, "232023771");
+      osi_free(p_buf);
+      p_ret = NULL;
+      return p_ret;
+    }
     p_lcb->p_rx_msg = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
     memcpy(p_lcb->p_rx_msg, p_buf, sizeof(BT_HDR) + p_buf->offset + p_buf->len);
 
diff --git a/stack/avdt/avdt_msg.cc b/stack/avdt/avdt_msg.cc
index e1ba9aefb..453e18642 100644
--- a/stack/avdt/avdt_msg.cc
+++ b/stack/avdt/avdt_msg.cc
@@ -1222,11 +1222,13 @@ BT_HDR* avdt_msg_asmbl(AvdtpCcb* p_ccb, BT_HDR* p_buf) {
      * not aware of possible packet size after reassembly, they
      * would have allocated smaller buffer.
      */
-    p_ccb->p_rx_msg = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
     if (sizeof(BT_HDR) + p_buf->offset + p_buf->len > BT_DEFAULT_BUFFER_SIZE) {
       android_errorWriteLog(0x534e4554, "232023771");
-      return NULL;
+      osi_free(p_buf);
+      p_ret = NULL;
+      return p_ret;
     }
+    p_ccb->p_rx_msg = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
     memcpy(p_ccb->p_rx_msg, p_buf, sizeof(BT_HDR) + p_buf->offset + p_buf->len);
 
     /* Free original buffer */