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avcodec/ffv1dec: Check for 0 quant tables 

Fixes assertion failure
Fixes: 07ec1fc3c1cbf2d3edcd7d9b52ca156c/asan_heap-oob_13624c5_491_ecd4720a03e697ba750b235690656c8f.avi

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-05 00:36:59 +01:00
parent 9bec6d71a2
commit 5745cf799a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffv1dec.c
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@ -569,7 +569,7 @@ static int read_extra_header(FFV1Context *f)
}
f->quant_table_count = get_symbol(c, state, 0);
if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count)
return AVERROR_INVALIDDATA;
for (i = 0; i < f->quant_table_count; i++) {