From 8a0cd58729364c7d8cf4361aa586f3d0dc43ebb4 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 26 Jun 2012 00:38:05 +0200
Subject: [PATCH] sonic: fix FPE

Fixes Ticket1397

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/sonic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
index da0f5490a1..d42b07de06 100644
--- a/libavcodec/sonic.c
+++ b/libavcodec/sonic.c
@@ -796,6 +796,11 @@ static av_cold int sonic_decode_init(AVCodecContext *avctx)
     s->decorrelation = get_bits(&gb, 2);
 
     s->downsampling = get_bits(&gb, 2);
+    if (!s->downsampling) {
+        av_log(avctx, AV_LOG_ERROR, "invalid downsampling value\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     s->num_taps = (get_bits(&gb, 5)+1)<<5;
     if (get_bits1(&gb)) // XXX FIXME
         av_log(avctx, AV_LOG_INFO, "Custom quant table\n");