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vqavideo: check the version

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Prevent out of buffer write.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit c4abc9098c)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2013-06-27 03:19:05 +02:00
parent a747cf8873
commit fb1823e178
1 changed files with 11 additions and 0 deletions
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11
libavcodec/vqavideo.c
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@ -135,6 +135,17 @@ static av_cold int vqa_decode_init(AVCodecContext *avctx)
/* load up the VQA parameters from the header */
s->vqa_version = s->avctx->extradata[0];
switch (s->vqa_version) {
case 1:
case 2:
break;
case 3:
av_log_missing_feature(avctx, "VQA Version 3", 0);
return AVERROR_PATCHWELCOME;
default:
av_log_missing_feature(avctx, "VQA Version", 1);
return AVERROR_PATCHWELCOME;
}
s->width = AV_RL16(&s->avctx->extradata[6]);
s->height = AV_RL16(&s->avctx->extradata[8]);
if(av_image_check_size(s->width, s->height, 0, avctx)){