From a2d1922bde8db2cdac95051918fe81ae18c0376b Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Date: Wed, 10 Jun 2015 00:12:38 +0200
Subject: [PATCH] takdec: ensure chan2 is a valid channel index
If chan2 is not smaller than the number of channels, it can cause
segmentation faults due to dereferencing a NULL pointer.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
libavcodec/takdec.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index c84cca448d3..93098be7e4e 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -806,6 +806,12 @@ static int tak_decode_frame(AVCodecContext *avctx, void *data,
if (s->mcdparams[i].present) {
s->mcdparams[i].index = get_bits(gb, 2);
s->mcdparams[i].chan2 = get_bits(gb, 4);
+ if (s->mcdparams[i].chan2 >= avctx->channels) {
+ av_log(avctx, AV_LOG_ERROR,
+ "invalid channel 2 (%d) for %d channel(s)\n",
+ s->mcdparams[i].chan2, avctx->channels);
+ return AVERROR_INVALIDDATA;
+ }
if (s->mcdparams[i].index == 1) {
if ((nbit == s->mcdparams[i].chan2) ||
(ch_mask & 1 << s->mcdparams[i].chan2))
--
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