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avcodec/magicyuv: Check that vlc len is not too large 

Fixes: runtime error: shift exponent -95 is negative
Fixes: 2568/clusterfuzz-testcase-minimized-4926115716005888

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 341f01290c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-12 17:25:16 +02:00
parent dbb121688c
commit 6ae1b70cb4
1 changed files with 2 additions and 2 deletions
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4
libavcodec/magicyuv.c
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@ -97,7 +97,7 @@ static int huff_build10(VLC *vlc, uint8_t *len)
for (i = 0; i < 1024; i++) {
he[i].sym = 1023 - i;
he[i].len = len[i];
if (len[i] == 0)
if (len[i] == 0 || len[i] > 32)
return AVERROR_INVALIDDATA;
}
AV_QSORT(he, 1024, HuffEntry, huff_cmp_len10);
@ -129,7 +129,7 @@ static int huff_build(VLC *vlc, uint8_t *len)
for (i = 0; i < 256; i++) {
he[i].sym = 255 - i;
he[i].len = len[i];
if (len[i] == 0)
if (len[i] == 0 || len[i] > 32)
return AVERROR_INVALIDDATA;
}
AV_QSORT(he, 256, HuffEntry, huff_cmp_len);