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avcodec/h264_slice: Limit max_contexts when slice_context_count is initialized

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Fixes out of array access
Fixes: 1430e9c43fae47a24c179c7c54f94918/signal_sigsegv_421427_2049_f2192b6829ab6e0eefcb035329c03c60.264

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4ea4d2f438)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-24 22:12:37 +01:00
parent ee5ba259d1
commit e9ec9be146
1 changed files with 1 additions and 0 deletions
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libavcodec/h264_slice.c
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@ -1211,6 +1211,7 @@ static int h264_slice_header_init(H264Context *h, int reinit)
nb_slices = max_slices;
}
h->slice_context_count = nb_slices;
h->max_contexts = FFMIN(h->max_contexts, nb_slices);
if (!HAVE_THREADS || !(h->avctx->active_thread_type & FF_THREAD_SLICE)) {
ret = ff_h264_context_init(h);