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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-21 23:22:39 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-06 20:30:57 +0100 |
| commit | 08e46a341a40ac4aeac0c29921c04ce329085d29 (patch) | |
| tree | 9bd10ba3c3c8c02ebe44bf0e0f9926e10e5926c0 | |
| parent | 6bfec5efc4e2e3f52f169d431a282ddeaeb148db (diff) | |
| download | ffmpeg-08e46a341a40ac4aeac0c29921c04ce329085d29.tar.gz | |
avcodec/iff: Check for overlap in cmap_read_palette()
Fixes: undefined memcpy() use
Fixes: 16302/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5678750575886336
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 dfa5d1a3667fa38e07373becc2401175b31d8228)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/iff.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/iff.c b/libavcodec/iff.c index e3793e32ee..de9ea67517 100644 --- a/libavcodec/iff.c +++ b/libavcodec/iff.c @@ -171,6 +171,10 @@ static int cmap_read_palette(AVCodecContext *avctx, uint32_t *pal) pal[i] = 0xFF000000 | gray2rgb((i * 255) >> avctx->bits_per_coded_sample); } if (s->masking == MASK_HAS_MASK) { + if ((1 << avctx->bits_per_coded_sample) < count) { + avpriv_request_sample(avctx, "overlapping mask"); + return AVERROR_PATCHWELCOME; + } memcpy(pal + (1 << avctx->bits_per_coded_sample), pal, count * 4); for (i = 0; i < count; i++) pal[i] &= 0xFFFFFF; |