From: Anthony Liguori <aliguori@us.ibm.com>
Date: Fri, 22 May 2009 13:17:55 +0000 (-0500)
Subject: Fix segv when passing an unknown protocol
X-Git-Tag: v0.11.0-rc0~546
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c833ab7351f2ebac46740380a81e34482e208dcc;p=thirdparty%2Fqemu.git

Fix segv when passing an unknown protocol

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---

diff --git a/block.c b/block.c
index 980fbecf3d9..cbc83b166e4 100644
--- a/block.c
+++ b/block.c
@@ -306,7 +306,7 @@ static BlockDriver *find_image_format(const char *filename)
 
     drv = find_protocol(filename);
     /* no need to test disk image formats for vvfat */
-    if (strcmp(drv->format_name, "vvfat") == 0)
+    if (drv && strcmp(drv->format_name, "vvfat") == 0)
         return drv;
 
     ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);