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The following commit(s) were added to refs/heads/master by this push:
new d60c1d72c1 avcodec/jpeg2000dec: Make M_b check broader
d60c1d72c1 is described below
commit d60c1d72c1299e683c1d2f86cb4332b4d88348a5
Author: Michael Niedermayer <[email protected]>
AuthorDate: Mon Dec 22 23:17:24 2025 +0100
Commit: michaelni <[email protected]>
CommitDate: Tue Dec 23 20:11:29 2025 +0000
avcodec/jpeg2000dec: Make M_b check broader
Fixes: shift exponent -1 is negative
Fixes:
429330004/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-4733213845291008
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/jpeg2000dec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index de1a73b92b..276c0a6e43 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -2270,8 +2270,8 @@ static inline int tile_codeblocks(const
Jpeg2000DecoderContext *s, Jpeg2000Tile
band->coord[1][0] == band->coord[1][1])
continue;
- if ((codsty->cblk_style & JPEG2000_CTSY_HTJ2K_F) && M_b >= 31)
{
- avpriv_request_sample(s->avctx, "JPEG2000_CTSY_HTJ2K_F and
M_b >= 31");
+ if (M_b >= 31) {
+ avpriv_request_sample(s->avctx, "M_b >= 31");
return AVERROR_PATCHWELCOME;
}
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