From: Luca Barbato <lu_zero@gentoo.org>
Date: Tue, 9 Jul 2013 07:18:16 +0000 (+0200)
Subject: imc: Catch a division by zero
X-Git-Tag: v10_alpha1~1193
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bbf6a4aa20bfe3d7869b2218e66063602dfb8aa7;p=platform%2Fupstream%2Flibav.git

imc: Catch a division by zero

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
---

diff --git a/libavcodec/imc.c b/libavcodec/imc.c
index 2749099..e3f5e15 100644
--- a/libavcodec/imc.c
+++ b/libavcodec/imc.c
@@ -449,6 +449,10 @@ 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;