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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-09-15 00:20:38 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-10-07 21:34:00 +0200 |
| commit | 5a4234de5eb3f4608f4b4f42cb6da1a0e2c00c85 (patch) | |
| tree | 7e6f7f35d0a9e7c3a7786579fb3413acdaaaab62 /libavcodec | |
| parent | 47f608a7e146d57bb910c3b2e2f4dd24ecef4ab1 (diff) | |
| download | ffmpeg-5a4234de5eb3f4608f4b4f42cb6da1a0e2c00c85.tar.gz | |
avcodec/mpeg4videodec: Fix undefined shift in get_amv()
Fixes: runtime error: shift exponent -1 is negative
Fixes: 9938/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5653783529914368
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 c88afa44c4823aba7b6f4a1b01fd6a4169643c57)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index 1686ed1001..f9ec0fd0c9 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -596,7 +596,7 @@ static inline int get_amv(Mpeg4DecContext *ctx, int n) len >>= s->quarter_sample; if (s->real_sprite_warping_points == 1) { - if (ctx->divx_version == 500 && ctx->divx_build == 413) + if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample) sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample)); else sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a); |