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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-07-19 01:43:24 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-07-24 03:03:14 +0200 |
| commit | f10252e47d81ac043cd3a9e5d04e38f6e8ed4e26 (patch) | |
| tree | 59482c985b50f374bd12fcf6a2a9618f581168f9 | |
| parent | 4627033a236c538f76abb83f84d021af3eacd907 (diff) | |
| download | ffmpeg-f10252e47d81ac043cd3a9e5d04e38f6e8ed4e26.tar.gz | |
avcodec/dirac_vlc: Fix undefined shift
Fixes: runtime error: shift exponent 64 is too large for 64-bit type 'residual' (aka 'unsigned long')
Fixes: 2674/clusterfuzz-testcase-minimized-4999700518273024
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 69e7daf6ce2a5893936ba18572c58180b29d67f9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/dirac_vlc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavcodec/dirac_vlc.c b/libavcodec/dirac_vlc.c index 336d22a182..773f720858 100644 --- a/libavcodec/dirac_vlc.c +++ b/libavcodec/dirac_vlc.c @@ -216,9 +216,14 @@ static void generate_offset_lut(DiracGolombLUT *lut, int off) INIT_RESIDUE(res); SET_RESIDUE(res, idx, LUT_BITS); - l->preamble = CONVERT_TO_RESIDUE(res >> (RSIZE_BITS - off), off); l->preamble_bits = off; - l->sign = ((l->preamble >> (RSIZE_BITS - l->preamble_bits)) & 1) ? -1 : +1; + if (off) { + l->preamble = CONVERT_TO_RESIDUE(res >> (RSIZE_BITS - off), off); + l->sign = ((l->preamble >> (RSIZE_BITS - l->preamble_bits)) & 1) ? -1 : +1; + } else { + l->preamble = 0; + l->sign = 1; + } search_for_golomb(l, res << off, LUT_BITS - off); } |