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svq1dec: check that the reference frame matches in size before using it. 

Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-07 23:42:35 +01:00
parent dbf0a90572
commit 3b57bb478f
1 changed files with 1 additions and 1 deletions
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2
libavcodec/svq1dec.c
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@ -692,7 +692,7 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
} else {
/* delta frame */
uint8_t *previous = s->prev->data[i];
if (!previous) {
if (!previous || s->prev->width != s->cur->width || s->prev->height != s->cur->height) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
result = AVERROR_INVALIDDATA;
goto err;