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avcodec/mpeg4videodec: Fix runtime error: signed integer overflow: -135088512 * 16 cannot be represented in type 'int'

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Fixes: 736/clusterfuzz-testcase-5580263943831552

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 2017-03-08 22:25:08 +01:00
parent 222c9f031d
commit e2a4f1a9eb
1 changed files with 11 additions and 1 deletions
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12
libavcodec/mpeg4videodec.c
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@ -387,11 +387,21 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
}
for (i = 0; i < 2; i++) {
int64_t sd[2] = {
s->sprite_delta[i][0] - a * (1LL<<16),
s->sprite_delta[i][1] - a * (1LL<<16)
};
if (llabs(s->sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(s->sprite_offset[0][i] + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(s->sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL) + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(s->sprite_delta[i][1] * (w+16LL)) >= INT_MAX
llabs(s->sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
llabs(sd[0]) >= INT_MAX ||
llabs(sd[1]) >= INT_MAX ||
llabs(s->sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
llabs(s->sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
llabs(s->sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
) {
avpriv_request_sample(s->avctx, "Overflow on sprite points");
goto overflow;