From 3214db98ea1c71f6e6bb67adf077c695ac572692 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Thu, 17 Sep 2009 18:08:07 +0000
Subject: [PATCH] Improve dxa probe by checking the values for width and height
 are reasonable.

Originally committed as revision 19897 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/dxa.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/dxa.c b/libavformat/dxa.c
index 5b6cd67b59..a68d4c4efb 100644
--- a/libavformat/dxa.c
+++ b/libavformat/dxa.c
@@ -36,9 +36,15 @@ typedef struct{
 
 static int dxa_probe(AVProbeData *p)
 {
+    int w, h;
+    if (p->buf_size < 15)
+        return 0;
+    w = AV_RB16(p->buf + 11);
+    h = AV_RB16(p->buf + 13);
     /* check file header */
     if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
-        p->buf[2] == 'X' && p->buf[3] == 'A')
+        p->buf[2] == 'X' && p->buf[3] == 'A' &&
+        w && w <= 2048 && h && h <= 2048)
         return AVPROBE_SCORE_MAX;
     else
         return 0;