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avcodec/vp8: Do not use num_coeff_partitions in thread/buffer setup 

The variable is not a constant and can lead to race conditions

Fixes: repro.webm (not reproducable with FFmpeg alone)

Found-by: Dale Curtis <dalecurtis@google.com>
Tested-by: Dale Curtis <dalecurtis@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-30 13:10:48 +02:00
parent 30ce6fd106
commit dabea74d0e
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vp8.c
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@ -164,7 +164,7 @@ int update_dimensions(VP8Context *s, int width, int height, int is_vp7)
s->mb_height = (s->avctx->coded_height + 15) / 16;
s->mb_layout = is_vp7 || avctx->active_thread_type == FF_THREAD_SLICE &&
FFMIN(s->num_coeff_partitions, avctx->thread_count) > 1;
avctx->thread_count > 1;
if (!s->mb_layout) { // Frame threading and one thread
s->macroblocks_base = av_mallocz((s->mb_width + s->mb_height * 2 + 1) *
sizeof(*s->macroblocks));