mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-23 14:39:24 -05:00
40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Hui Peng <phui@google.com>
|
|
Date: Mon, 2 Jan 2023 22:05:45 +0000
|
|
Subject: [PATCH] Fix an OOB access bug in A2DP_BuildMediaPayloadHeaderSbc
|
|
|
|
In A2DP_BuildCodecHeaderSbc when p_buf->offset is 0, the
|
|
`-=` operation on it may result in integer underflow and
|
|
OOB write with the computed pointer passed to
|
|
A2DP_BuildMediaPayloadHeaderSbc.
|
|
|
|
This is a backport of I45320085b1e458d3b0e0d86162a35aaaae7b34cb
|
|
Test: atest net_test_stack_a2dp_codecs_native
|
|
Ignore-AOSP-First: security
|
|
Tag:#security
|
|
|
|
Bug: 186803518
|
|
Change-Id: I4ff1a1de71884b8de23008b2569fdea3650e85ec
|
|
(cherry picked from commit a710300216be4a86373a65c6a685aeef8509cfa7)
|
|
Merged-In: I4ff1a1de71884b8de23008b2569fdea3650e85ec
|
|
---
|
|
stack/a2dp/a2dp_sbc.cc | 5 +++++
|
|
1 file changed, 5 insertions(+)
|
|
|
|
diff --git a/stack/a2dp/a2dp_sbc.cc b/stack/a2dp/a2dp_sbc.cc
|
|
index 54c3d1a26..f42939d54 100644
|
|
--- a/stack/a2dp/a2dp_sbc.cc
|
|
+++ b/stack/a2dp/a2dp_sbc.cc
|
|
@@ -859,6 +859,11 @@ bool A2DP_BuildCodecHeaderSbc(UNUSED_ATTR const uint8_t* p_codec_info,
|
|
BT_HDR* p_buf, uint16_t frames_per_packet) {
|
|
uint8_t* p;
|
|
|
|
+ // there is a timestamp right following p_buf
|
|
+ if (p_buf->offset < 4 + A2DP_SBC_MPL_HDR_LEN) {
|
|
+ return false;
|
|
+ }
|
|
+
|
|
p_buf->offset -= A2DP_SBC_MPL_HDR_LEN;
|
|
p = (uint8_t*)(p_buf + 1) + p_buf->offset;
|
|
p_buf->len += A2DP_SBC_MPL_HDR_LEN;
|