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h263dec: Prevent dimension changes from leaking on errors in header parsing.

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This fixes crashes with frame threads caused by inconsistent context parameters.

Fixes Ticket1207

Found-by: John Villamil
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-18 21:03:03 +02:00
parent 601d072e68
commit a02f8ef1d2
1 changed files with 8 additions and 0 deletions
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8
libavcodec/h263dec.c
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@ -438,6 +438,14 @@ retry:
ret = ff_h263_decode_picture_header(s);
}
if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME) && ret < 0) {
if ( s->width != avctx->coded_width
|| s->height != avctx->coded_height) {
av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
s->width = avctx->coded_width;
s->height= avctx->coded_height;
}
}
if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
/* skip if the header was thrashed */