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authorKevin Wolf <kwolf@redhat.com>2013-03-18 16:20:27 +0100
committerKevin Wolf <kwolf@redhat.com>2013-03-22 17:51:32 +0100
commitf5866fa438bff586f215c137dc71edb4e0770536 (patch)
tree693536fcf30715668dd6f4962ea3a839ad018e1e /block/dmg.c
parent08b392e1510b21d8c9bfa8a50525fae31014a2e2 (diff)
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block: Make find_image_format safe with NULL filename
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>
Diffstat (limited to 'block/dmg.c')
-rw-r--r--block/dmg.c13
1 files changed, 10 insertions, 3 deletions
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;
}