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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>
This commit is contained in:
Michael Niedermayer 2017-02-19 21:33:27 +01:00
parent c91bdd4524
commit aa2b75263e
1 changed files with 6 additions and 0 deletions
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6
libavcodec/mpeg4videodec.c
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@ -367,6 +367,12 @@ 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;