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avcodec/proresdec: Consider negative bits left 

Fixes: 70036/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_fuzzer-6298797647396864
Fixes: shift exponent 40 is too large for 32-bit type 'uint32_t' (aka 'unsigned int')

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 419eee6356)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-07-19 19:21:41 +02:00
parent aa564c7cbd
commit 11834dcd8b
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GPG Key ID: B18E8928B3948D64
1 changed files with 1 additions and 1 deletions
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libavcodec/proresdec2.c
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@ -488,7 +488,7 @@ static av_always_inline int decode_ac_coeffs(AVCodecContext *avctx, GetBitContex
for (pos = block_mask;;) { for (pos = block_mask;;) {
bits_left = gb->size_in_bits - re_index; bits_left = gb->size_in_bits - re_index;
if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left))) if (bits_left <= 0 || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
break; break;
DECODE_CODEWORD(run, run_to_cb[FFMIN(run, 15)], LAST_SKIP_BITS); DECODE_CODEWORD(run, run_to_cb[FFMIN(run, 15)], LAST_SKIP_BITS);