Commit 31d47266 authored Apr 13, 2017 by Stefano Stabellini Committed by Juergen Gross May 02, 2017

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: dan.carpenter@oracle.com
CC: jgross@suse.com
CC: boris.ostrovsky@oracle.com
CC: Eric Van Hensbergen <ericvh@gmail.com>
CC: Ron Minnich <rminnich@sandia.gov>
CC: Latchesar Ionkov <lucho@ionkov.net>
CC: v9fs-developer@lists.sourceforge.net
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

parent 29985b09

net/9p/trans_xen.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)

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