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55 lines
1.8 KiB
Diff
55 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hui Peng <phui@google.com>
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Date: Thu, 8 Dec 2022 01:08:11 +0000
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Subject: [PATCH] Fix OOB access in avdt_scb_hdl_pkt_no_frag
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This is a back port of the following 2 CLs:
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- Id13b1ebde8f603123c8b7a49922b2f1378ab788f
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- If0c7b25f2e6cb4531bbb6254e176e8ad1b5c5fb4
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Regression test: I9c87e30ed58e7ad6a34ab7c96b0a8fb06324ad54
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Bug: 142546355 258057241
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Test: atest net_test_stack_avdtp
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Ignore-AOSP-First: security
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Change-Id: Ie1707385d6452ece47915c153f4faaa1c8a287c9
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(cherry picked from commit b0b968e8c6214e20a5dc3617d66567225df0884f)
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Merged-In: Ie1707385d6452ece47915c153f4faaa1c8a287c9
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---
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stack/avdt/avdt_scb_act.cc | 13 +++++++++----
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1 file changed, 9 insertions(+), 4 deletions(-)
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diff --git a/stack/avdt/avdt_scb_act.cc b/stack/avdt/avdt_scb_act.cc
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index ce53c45eb..f2de4ba35 100644
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--- a/stack/avdt/avdt_scb_act.cc
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+++ b/stack/avdt/avdt_scb_act.cc
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@@ -255,19 +255,24 @@ void avdt_scb_hdl_pkt_no_frag(AvdtpScb* p_scb, tAVDT_SCB_EVT* p_data) {
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if (offset > len) goto length_error;
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p += 2;
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BE_STREAM_TO_UINT16(ex_len, p);
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- offset += ex_len * 4;
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p += ex_len * 4;
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}
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+ if ((p - p_start) >= len) {
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+ AVDT_TRACE_WARNING("%s: handling malformatted packet: ex_len too large", __func__);
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+ osi_free_and_reset((void**)&p_data->p_pkt);
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+ return;
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+ }
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+ offset = p - p_start;
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+
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/* adjust length for any padding at end of packet */
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if (o_p) {
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/* padding length in last byte of packet */
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- pad_len = *(p_start + p_data->p_pkt->len);
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+ pad_len = *(p_start + len - 1);
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}
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/* do sanity check */
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- if ((offset > p_data->p_pkt->len) ||
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- ((pad_len + offset) > p_data->p_pkt->len)) {
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+ if (pad_len >= (len - offset)) {
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AVDT_TRACE_WARNING("Got bad media packet");
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osi_free_and_reset((void**)&p_data->p_pkt);
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}
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