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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-22 21:57:49 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-23 13:15:16 +0200 |
| commit | 1d26b5c0b02f80ea66106c6b450c5d60c760fd67 (patch) | |
| tree | c6e53a18b3cd5c76cdad2ef276c9dd255f568d5c | |
| parent | 4c4efea5c47b289306253ae7c8f450c4381230a4 (diff) | |
| download | ffmpeg-1d26b5c0b02f80ea66106c6b450c5d60c760fd67.tar.gz | |
avcodec/mpeg4videodec: Check sprite_offset in addition to shifts
Fixes: 651/clusterfuzz-testcase-5710668915277824
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 6871df02d973c9ffc1aa4f6d08fb4b1b63d411be)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index e2b230e6ad..72ced2c4da 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -365,8 +365,13 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g int shift_y = 16 - ctx->sprite_shift[0]; int shift_c = 16 - ctx->sprite_shift[1]; - if (shift_c < 0 || shift_y < 0) { - avpriv_request_sample(s->avctx, "Too large sprite shift"); + if (shift_c < 0 || shift_y < 0 || + FFABS(s->sprite_offset[0][0]) >= INT_MAX >> shift_y || + FFABS(s->sprite_offset[1][0]) >= INT_MAX >> shift_c || + FFABS(s->sprite_offset[0][1]) >= INT_MAX >> shift_y || + FFABS(s->sprite_offset[1][1]) >= INT_MAX >> shift_c + ) { + avpriv_request_sample(s->avctx, "Too large sprite shift or offset"); return AVERROR_PATCHWELCOME; } |