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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-23 22:33:16 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-24 00:38:45 +0100 |
| commit | 76ba09d18245a2a41dc5f93a60fd00cdf358cb1f (patch) | |
| tree | 723e94950fd369858853231fd290dcd4c47e6d94 /libavcodec | |
| parent | 359586f14f46bf3f9c1ae3375d80e8c0fc377bef (diff) | |
| download | ffmpeg-76ba09d18245a2a41dc5f93a60fd00cdf358cb1f.tar.gz | |
avcodec/mpeg4videodec: Check the other 3 sprite points for intermediate overflows
This is not necessarily specific to fuzzed files
Fixes: Multiple integer overflows
Fixes: 656/clusterfuzz-testcase-6463814516080640
Fixes: 658/clusterfuzz-testcase-6691260146384896
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index 2216cd56e8..dac9538436 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -384,6 +384,13 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g s->sprite_delta[0][i] *= 1 << shift_y; s->sprite_delta[1][i] *= 1 << shift_y; ctx->sprite_shift[i] = 16; + + if (llabs(s->sprite_offset[i][0] + s->sprite_delta[i][0] * (int64_t)w) >= INT_MAX || + llabs(s->sprite_offset[i][0] + s->sprite_delta[i][1] * (int64_t)h) >= INT_MAX || + llabs(s->sprite_offset[i][0] + s->sprite_delta[i][0] * (int64_t)w + s->sprite_delta[i][1] * (int64_t)h) >= INT_MAX) { + avpriv_request_sample(s->avctx, "Overflow on sprite points"); + return AVERROR_PATCHWELCOME; + } } s->real_sprite_warping_points = ctx->num_sprite_warping_points; } |