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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-19 21:33:27 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-23 13:15:16 +0200 |
| commit | 0d05a80c2b7133aa405bd25c97f92b99ade238e5 (patch) | |
| tree | bc4f52dff2b2e2935809b000f558ac2a6f6e6a83 | |
| parent | 0171371298e2ea37ffcd28e53c2fc9185e673811 (diff) | |
| download | ffmpeg-0d05a80c2b7133aa405bd25c97f92b99ade238e5.tar.gz | |
avcodec/mpeg4videodec: Fix runtime error: shift exponent -2 is negative
Fixes: 612/clusterfuzz-testcase-4707817137111040
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 aa2b75263e17651187b1475551a02aa2f4ff65fe)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index 8b6bc54c66..bc3fbd9195 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -364,6 +364,12 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g } else { 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"); + return AVERROR_PATCHWELCOME; + } + for (i = 0; i < 2; i++) { s->sprite_offset[0][i] *= 1 << shift_y; s->sprite_offset[1][i] *= 1 << shift_c; |