xen-blkback: really don't leak mode property

Commit 9d092603cc ("xen-blkback: do not leak mode property") left one
path unfixed; correct this.

Acked-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
(cherry picked from commit aea305e11f7a7af12aa2beb7c7e053a338659c49)
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Orabug: 24820937

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index ec93a4d305d4b35df3012b281deedb0cfd048fcb..5cd2ba63119a317e5e73df85df3a00a61de07878 100644 (file)
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -715,8 +715,11 @@ static void backend_changed(struct xenbus_watch *watch,
 
        /* Front end dir is a number, which is used as the handle. */
        err = kstrtoul(strrchr(dev->otherend, '/') + 1, 0, &handle);
-       if (err)
+       if (err) {
+               kfree(be->mode);
+               be->mode = NULL;
                return;
+       }
 
        be->major = major;
        be->minor = minor;