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mpeg12: do not decode extradata more than once.

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Fixes CVE-2012-2803.

(cherry picked from commit 5823686261)

Conflicts:

	libavcodec/mpeg12.c
	libavcodec/mpeg12.h
This commit is contained in:
Anton Khirnov 2012-12-13 17:53:31 +01:00 committed by Reinhard Tartler
parent 440e98574b
commit 301761792a
1 changed files with 4 additions and 1 deletions
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5
libavcodec/mpeg12.c
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@ -1147,6 +1147,7 @@ typedef struct Mpeg1Context {
int save_width, save_height, save_progressive_seq;
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
int extradata_decoded;
} Mpeg1Context;
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
@ -2279,8 +2280,10 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
s->slice_count= 0;
if(avctx->extradata && !avctx->frame_number)
if (avctx->extradata && !s->extradata_decoded) {
decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
s->extradata_decoded = 1;
}
return decode_chunks(avctx, picture, data_size, buf, buf_size);
}