X-Git-Url: http://vcs.maemo.org/git/?a=blobdiff_plain;f=block-cow.c;h=eeeab7068b729a9bfe0b80cb635ccb1bc1f26982;hb=b195775fef3c221ff04e3091005e16c5745bf3c8;hp=15270dfd3fa720db82d8243ff8e3b9d18e45c22d;hpb=2b03a7a5bc4b23d912e0d8d23c8486ac8eec8a1d;p=qemu

diff --git a/block-cow.c b/block-cow.c
index 15270df..eeeab70 100644
--- a/block-cow.c
+++ b/block-cow.c
@@ -54,7 +54,8 @@ static int cow_probe(const uint8_t *buf, int buf_size, const char *filename)
 {
     const struct cow_header_v2 *cow_header = (const void *)buf;
 
-    if (be32_to_cpu(cow_header->magic) == COW_MAGIC &&
+    if (buf_size >= sizeof(struct cow_header_v2) &&
+        be32_to_cpu(cow_header->magic) == COW_MAGIC &&
         be32_to_cpu(cow_header->version) == COW_VERSION) 
         return 100;
     else