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proresdec: Fix read via negative index in a global array.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-29 04:39:37 +01:00
parent e39487efe3
commit 0065080320
1 changed files with 1 additions and 1 deletions
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2
libavcodec/proresdec2.c
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@ -302,7 +302,7 @@ static av_always_inline void decode_dc_coeffs(GetBitContext *gb, DCTELEM *out,
code = 5; code = 5;
sign = 0; sign = 0;
for (i = 1; i < blocks_per_slice; i++, out += 64) { for (i = 1; i < blocks_per_slice; i++, out += 64) {
DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6)]); DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6U)]);
if(code) sign ^= -(code & 1); if(code) sign ^= -(code & 1);
else sign = 0; else sign = 0;
prev_dc += (((code + 1) >> 1) ^ sign) - sign; prev_dc += (((code + 1) >> 1) ^ sign) - sign;