From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Hui Peng Date: Thu, 8 Dec 2022 01:08:11 +0000 Subject: [PATCH] Fix OOB access in avdt_scb_hdl_pkt_no_frag This is a back port of the following 2 CLs: - Id13b1ebde8f603123c8b7a49922b2f1378ab788f - If0c7b25f2e6cb4531bbb6254e176e8ad1b5c5fb4 Regression test: I9c87e30ed58e7ad6a34ab7c96b0a8fb06324ad54 Bug: 142546355 258057241 Test: atest net_test_stack_avdtp Ignore-AOSP-First: security Change-Id: Ie1707385d6452ece47915c153f4faaa1c8a287c9 (cherry picked from commit b0b968e8c6214e20a5dc3617d66567225df0884f) Merged-In: Ie1707385d6452ece47915c153f4faaa1c8a287c9 --- stack/avdt/avdt_scb_act.cc | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/stack/avdt/avdt_scb_act.cc b/stack/avdt/avdt_scb_act.cc index ea9c0bceb..865eb30d6 100644 --- a/stack/avdt/avdt_scb_act.cc +++ b/stack/avdt/avdt_scb_act.cc @@ -256,19 +256,24 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB* p_scb, tAVDT_SCB_EVT* p_data) { if (offset > len) goto length_error; p += 2; BE_STREAM_TO_UINT16(ex_len, p); - offset += ex_len * 4; p += ex_len * 4; } + if ((p - p_start) >= len) { + AVDT_TRACE_WARNING("%s: handling malformatted packet: ex_len too large", __func__); + osi_free_and_reset((void**)&p_data->p_pkt); + return; + } + offset = p - p_start; + /* adjust length for any padding at end of packet */ if (o_p) { /* padding length in last byte of packet */ - pad_len = *(p_start + p_data->p_pkt->len); + pad_len = *(p_start + len - 1); } /* do sanity check */ - if ((offset > p_data->p_pkt->len) || - ((pad_len + offset) > p_data->p_pkt->len)) { + if (pad_len >= (len - offset)) { AVDT_TRACE_WARNING("Got bad media packet"); osi_free_and_reset((void**)&p_data->p_pkt); }