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[11/14] block: Make find_image_format safe with NULL filename

Message ID 1363974083-28440-12-git-send-email-kwolf@redhat.com
State New
Headers show

Commit Message

Kevin Wolf March 22, 2013, 5:41 p.m. UTC 
In order to achieve this, the .bdrv_probe callbacks of all drivers must
cope with this. The DMG driver is the only one that bases its decision
on the filename and it needs to be changed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/dmg.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
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Patch

diff --git a/block/dmg.c b/block/dmg.c
index c1066df..3141cb5 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -51,9 +51,16 @@  typedef struct BDRVDMGState {
 
 static int dmg_probe(const uint8_t *buf, int buf_size, const char *filename)
 {
-    int len=strlen(filename);
-    if(len>4 && !strcmp(filename+len-4,".dmg"))
-	return 2;
+    int len;
+
+    if (!filename) {
+        return 0;
+    }
+
+    len = strlen(filename);
+    if (len > 4 && !strcmp(filename + len - 4, ".dmg")) {
+        return 2;
+    }
     return 0;
 }