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imc: Catch a division by zero

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit bbf6a4aa20)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2013-07-09 09:18:16 +02:00
parent aa99cb15f6
commit 6d2a92c467
1 changed files with 4 additions and 0 deletions
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4
libavcodec/imc.c
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@ -450,6 +450,10 @@ static int bit_allocation(IMCContext *q, IMCChannel *chctx,
iacc += chctx->bandWidthT[i];
summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i];
}
if (!iacc)
return AVERROR_INVALIDDATA;
chctx->bandWidthT[BANDS - 1] = 0;
summa = (summa * 0.5 - freebits) / iacc;