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54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Cheney Ni <cheneyni@google.com>
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Date: Fri, 1 Oct 2021 20:44:20 +0800
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Subject: [PATCH] AVDTP: Fix a potential overflow about the media payload
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offset
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This variable is uint16, and is possible to overflow when the length of
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header extension is larger. Here we compare with the data length to
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prevent any exceptions.
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Bug: 142546355
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Tag: #security
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Test: A2DP sink playback
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Ignore-AOSP-First: security vulnerabilities
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Change-Id: Id13b1ebde8f603123c8b7a49922b2f1378ab788f
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---
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stack/avdt/avdt_scb_act.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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diff --git a/stack/avdt/avdt_scb_act.c b/stack/avdt/avdt_scb_act.c
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index 5537c3d1d..011bff1c5 100644
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--- a/stack/avdt/avdt_scb_act.c
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+++ b/stack/avdt/avdt_scb_act.c
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@@ -291,19 +291,26 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB *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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+ {
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+ android_errorWriteLog(0x534e4554, "142546355");
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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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{
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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);
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}
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/* do sanity check */
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- if ((offset > p_data->p_pkt->len) || ((pad_len + offset) > p_data->p_pkt->len))
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+ if (pad_len > (len - offset))
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{
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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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