diff options
-rw-r--r-- | block/dmg.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/block/dmg.c b/block/dmg.c index c1066df13a..3141cb5b88 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; } |