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avcodec/ffv1dec: Clear quant_table_count if its invalid 

Fixes deallocation of corrupted pointer
Fixes: 343dfbe142a38b521ed069dc4ea7c03b/signal_sigsegv_421427_4074_ffb11959610278cd40dbc153464aa254.avi
No releases affected

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit e04126072e)

Fixes ticket #5052.
This commit is contained in:
Michael Niedermayer 2015-11-14 13:21:58 +01:00 committed by Carl Eugen Hoyos
parent d9593e0751
commit 65f4425ad5
1 changed files with 1 additions and 0 deletions
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libavcodec/ffv1dec.c
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@ -535,6 +535,7 @@ 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 || !f->quant_table_count) {
av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);
f->quant_table_count = 0;
return AVERROR_INVALIDDATA;
}