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avcodec/iff: Clear ham_buf

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Fixes: use of uninitialized memory
Fixes: 423673969/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-6651797156724736

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-08-03 14:44:04 +02:00 • committed by michaelni
parent 715df4b1ff
commit 7e9e7cb3b6
1 changed files with 1 additions and 1 deletions
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libavcodec/iff.c
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@ -279,7 +279,7 @@ static int extract_header(AVCodecContext *const avctx,
if (avctx->codec_tag == MKTAG('P', 'B', 'M', ' ') && s->ham == 4)
extra_space = 4;
s->ham_buf = av_malloc((s->planesize * 8) + AV_INPUT_BUFFER_PADDING_SIZE);
s->ham_buf = av_mallocz((s->planesize * 8) + AV_INPUT_BUFFER_PADDING_SIZE);
if (!s->ham_buf)
return AVERROR(ENOMEM);