xen/9pfs: initialize len to 0 to detect xenbus_read errors

In order to use "len" to check for xenbus_read errors properly, we need
to initialize len to 0 before passing it to xenbus_read.

CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: Eric Van Hensbergen <[email protected]>
CC: Ron Minnich <[email protected]>
CC: Latchesar Ionkov <[email protected]>
CC: [email protected]
Signed-off-by: Stefano Stabellini <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Signed-off-by: Juergen Gross <[email protected]>

diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index 47864245c0d4d7124012af94f33be75408bacc0e..71e85643b3f96db09de3330263f556fedba65257 100644 (file)
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -386,7 +386,7 @@ static int xen_9pfs_front_probe(struct xenbus_device *dev,
        struct xenbus_transaction xbt;
        struct xen_9pfs_front_priv *priv = NULL;
        char *versions;
-       unsigned int max_rings, max_ring_order, len;
+       unsigned int max_rings, max_ring_order, len = 0;
 
        versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len);
        if (!len)