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avcodec/tiff: add a zero DNG_LINEARIZATION_TABLE check

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Fixes: index 4294967295 out of bounds for type 'uint16_t [65536]'
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5950405086674944
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6666195176914944

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 2023-04-16 17:38:39 +02:00
parent 19b66b89da
commit 6e98cf0280
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GPG Key ID: B18E8928B3948D64
1 changed files with 1 additions and 1 deletions
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2
libavcodec/tiff.c
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@ -1451,7 +1451,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
break;
case TIFF_GRAY_RESPONSE_CURVE:
case DNG_LINEARIZATION_TABLE:
if (count > FF_ARRAY_ELEMS(s->dng_lut))
if (count < 1 || count > FF_ARRAY_ELEMS(s->dng_lut))
return AVERROR_INVALIDDATA;
for (int i = 0; i < count; i++)
s->dng_lut[i] = ff_tget(&s->gb, type, s->le);