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svq1dec: check that the reference frame has the same dimensions as the current one

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They can be different if the last keyframe failed to decode correctly.
Fixes possible invalid reads in such a case.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-04-08 22:12:12 +02:00
parent c0771a1ac6
commit b1bb8fb860
1 changed files with 2 additions and 1 deletions
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3
libavcodec/svq1dec.c
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@ -689,7 +689,8 @@ 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->width || s->prev->height != s->height) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
result = AVERROR_INVALIDDATA;
goto err;