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avcodec/hevc_cabac: Fix multiple integer overflows

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Fixes: 04ec80eefa77aecd7a49a442cc02baea/asan_heap-oob_19544fa_3303_1905796cd9d8e15f86d664332caabc00.bit

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-27 22:45:46 +01:00
parent 6b40755158
commit d5028f61e4
1 changed files with 7 additions and 3 deletions
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10
libavcodec/hevc_cabac.c
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@ -831,11 +831,13 @@ static av_always_inline int mvd_decode(HEVCContext *s)
int k = 1;
while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
ret += 1 << k;
ret += 1U << k;
k++;
}
if (k == CABAC_MAX_BIN)
if (k == CABAC_MAX_BIN) {
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
return 0;
}
while (k--)
ret += get_cabac_bypass(&s->HEVClc->cc) << k;
return get_cabac_bypass_sign(&s->HEVClc->cc, -ret);
@ -973,8 +975,10 @@ static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int
while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc))
prefix++;
if (prefix == CABAC_MAX_BIN)
if (prefix == CABAC_MAX_BIN) {
av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix);
return 0;
}
if (prefix < 3) {
for (i = 0; i < rc_rice_param; i++)
suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc);