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avcodec/jpeglsdec: force pal8 only once

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Fixes: Infinite loop
Fixes: 33958/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THP_fuzzer-6590264069193728
Fixes: 33981/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEGLS_fuzzer-5343224173559808
Fixes: 33986/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEG_fuzzer-6598815122587648
Fixes: 34001/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMVJPEG_fuzzer-6171098111672320

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 2021-05-10 21:36:18 +02:00
parent 06d23c6f3f
commit 864d1ef2fc
1 changed files with 5 additions and 2 deletions
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7
libavcodec/jpeglsdec.c
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@ -118,9 +118,12 @@ int ff_jpegls_decode_lse(MJpegDecodeContext *s)
shift = 8 - s->avctx->bits_per_raw_sample;
}
s->force_pal8 = 1;
if (!pal)
s->force_pal8++;
if (!pal) {
if (s->force_pal8 > 1)
return AVERROR_INVALIDDATA;
return 1;
}
for (i=s->palette_index; i<=maxtab; i++) {
uint8_t k = i << shift;