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avcodec/tiff: Check palette shift

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Fixes multiple  runtime error: shift exponent 792 is too large for 32-bit type 'unsigned int'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-14 01:34:14 +01:00
parent 58e9c7f4a2
commit cfa10e11be
1 changed files with 5 additions and 0 deletions
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5
libavcodec/tiff.c
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@ -996,6 +996,11 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
bytestream2_skip(&pal_gb[2], count / 3 * off * 2); bytestream2_skip(&pal_gb[2], count / 3 * off * 2);
off = (type_sizes[type] - 1) << 3; off = (type_sizes[type] - 1) << 3;
if (off > 31U) {
av_log(s->avctx, AV_LOG_ERROR, "palette shift %d is out of range\n", off);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < count / 3; i++) { for (i = 0; i < count / 3; i++) {
uint32_t p = 0xFF000000; uint32_t p = 0xFF000000;
p |= (ff_tget(&pal_gb[0], type, s->le) >> off) << 16; p |= (ff_tget(&pal_gb[0], type, s->le) >> off) << 16;