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avcodec/cavs: Check updated MV

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Fixes: runtime error: signed integer overflow: 251 + 2147483647 cannot be represented in type 'int'
Fixes: 1438/clusterfuzz-testcase-minimized-4917542646710272

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 5871adc90f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-10 14:41:23 +02:00
parent a98d82b13d
commit 7bbd92f69d
1 changed files with 9 additions and 2 deletions
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11
libavcodec/cavs.c
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@ -614,8 +614,15 @@ void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
mv_pred_median(h, mvP, mvA, mvB, mvC);
if (mode < MV_PRED_PSKIP) {
mvP->x += get_se_golomb(&h->gb);
mvP->y += get_se_golomb(&h->gb);
int mx = get_se_golomb(&h->gb) + (unsigned)mvP->x;
int my = get_se_golomb(&h->gb) + (unsigned)mvP->y;
if (mx != (int16_t)mx || my != (int16_t)my) {
av_log(h->avctx, AV_LOG_ERROR, "MV %d %d out of supported range\n", mx, my);
} else {
mvP->x = mx;
mvP->y = my;
}
}
set_mvs(mvP, size);
}