From 116aa30db4ae28f0b67cb2861ea534bfb840f3bc Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Sun, 28 Jul 2013 18:24:15 +0200
Subject: [PATCH] xl: Make sure the width is valid

CC: libav-stable@libav.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
 libavcodec/xl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/xl.c b/libavcodec/xl.c
index 1cadeab561..240339ea8b 100644
--- a/libavcodec/xl.c
+++ b/libavcodec/xl.c
@@ -71,6 +71,11 @@ static int decode_frame(AVCodecContext *avctx,
 
     stride = avctx->width - 4;
 
+    if (avctx->width % 4) {
+        av_log(avctx, AV_LOG_ERROR, "Width not a multiple of 4.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     if (buf_size < avctx->width * avctx->height) {
         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
         return AVERROR_INVALIDDATA;