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prores: Reject negative run and level values 

Sample-Id: 00000611-google

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-10-10 21:02:10 +02:00
parent 054454c63a
commit c0de9a23c7
1 changed files with 4 additions and 0 deletions
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4
libavcodec/proresdec.c
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@ -393,12 +393,16 @@ static inline int decode_ac_coeffs(GetBitContext *gb, int16_t *out,
return 0;
run = decode_vlc_codeword(gb, ff_prores_ac_codebook[run_cb_index]);
if (run < 0)
return AVERROR_INVALIDDATA;
bits_left = get_bits_left(gb);
if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left)))
return AVERROR_INVALIDDATA;
level = decode_vlc_codeword(gb, ff_prores_ac_codebook[lev_cb_index]) + 1;
if (level < 0)
return AVERROR_INVALIDDATA;
pos += run + 1;
if (pos >= max_coeffs)