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avcodec/cavs: Check updated MV
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>
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@ -613,8 +613,15 @@ void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
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mv_pred_median(h, mvP, mvA, mvB, mvC);
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if (mode < MV_PRED_PSKIP) {
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mvP->x += get_se_golomb(&h->gb);
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mvP->y += get_se_golomb(&h->gb);
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int mx = get_se_golomb(&h->gb) + (unsigned)mvP->x;
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int my = get_se_golomb(&h->gb) + (unsigned)mvP->y;
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if (mx != (int16_t)mx || my != (int16_t)my) {
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av_log(h->avctx, AV_LOG_ERROR, "MV %d %d out of supported range\n", mx, my);
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} else {
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mvP->x = mx;
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mvP->y = my;
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}
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}
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set_mvs(mvP, size);
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}
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