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commit 52b676bb29e9ea6af1b84a9fe7f35ad99a7502f0 Author: Michael Niedermayer <[email protected]> AuthorDate: Sun Feb 15 00:00:55 2026 +0100 Commit: michaelni <[email protected]> CommitDate: Wed Feb 18 23:45:28 2026 +0000 avcodec/cfhd: Check transform type before continuing Fixes: null pointer dereference Fixes: 471768165/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_DEC_fuzzer-6187504467509248 The first frame allocates buffers with one transform type the second frame sets up another transform type but the code to reallocate buffers is never triggered Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> --- libavcodec/cfhd.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c index 6d1cf4b67b..4d430e32ef 100644 --- a/libavcodec/cfhd.c +++ b/libavcodec/cfhd.c @@ -698,6 +698,11 @@ static int cfhd_decode(AVCodecContext *avctx, AVFrame *pic, if (s->subband_num_actual == 255) goto finish; + + if (tag == BitstreamMarker && data == CoefficientSegment || tag == BandHeader || tag == BandSecondPass || s->peak.level) + if (s->transform_type != s->a_transform_type) + return AVERROR_PATCHWELCOME; + coeff_data = s->plane[s->channel_num].subband[s->subband_num_actual]; /* Lowpass coefficients */ _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
