avformat/shortendec: Check k in probe

Fixes: Assertion failure
Fixes: 17640/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5708767475269632

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
pull/323/head
Michael Niedermayer 5 years ago
parent cf7f35ace5
commit ea770eb559
  1. 8
      libavformat/shortendec.c

@ -40,12 +40,18 @@ static int shn_probe(const AVProbeData *p)
channels = get_ur_golomb_shorten(&gb, 0);
blocksize = 256;
} else {
int k;
unsigned k;
k = get_ur_golomb_shorten(&gb, 2);
if (k > 31)
return 0;
internal_ftype = get_ur_golomb_shorten(&gb, k);
k = get_ur_golomb_shorten(&gb, 2);
if (k > 31)
return 0;
channels = get_ur_golomb_shorten(&gb, k);
k = get_ur_golomb_shorten(&gb, 2);
if (k > 31)
return 0;
blocksize = get_ur_golomb_shorten(&gb, k);
}

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