DivestOS/Patches/LineageOS-14.1/android_system_bt/345530.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.c | 9 ++++++++-
 stack/avdt/avdt_msg.c     | 6 ++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/stack/avct/avct_lcb_act.c b/stack/avct/avct_lcb_act.c
index 173c3070e..e1a7c3d26 100644
--- a/stack/avct/avct_lcb_act.c
+++ b/stack/avct/avct_lcb_act.c
@@ -92,13 +92,20 @@ 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.c b/stack/avdt/avdt_msg.c
index 65d4485e7..acda49858 100644
--- a/stack/avdt/avdt_msg.c
+++ b/stack/avdt/avdt_msg.c
@@ -1410,12 +1410,14 @@ BT_HDR *avdt_msg_asmbl(tAVDT_CCB *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);