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authorJan Beulich <JBeulich@suse.com>2014-12-09 14:47:04 +0300
committerDavid S. Miller <davem@davemloft.net>2014-12-10 02:30:08 +0300
commitf15650b7f94879667f253bc32de7431c1baf2d6e (patch)
tree6f4f05da21227b0d2cbd93694f5b6dce8ce4b413 /drivers/net/xen-netback/xenbus.c
parentceaca9dc3c7e6b7bf7e4af0693df7e1c48f6ac02 (diff)
downloadlinux-f15650b7f94879667f253bc32de7431c1baf2d6e.tar.xz
netback: don't store invalid vif pointer
When xenvif_alloc() fails, it returns a non-NULL error indicator. To avoid eventual races, we shouldn't store that into struct backend_info as readers of it only check for NULL. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback/xenbus.c')
-rw-r--r--drivers/net/xen-netback/xenbus.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index fab0d4b42f58..d44cd19169bd 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -404,6 +404,7 @@ static int backend_create_xenvif(struct backend_info *be)
int err;
long handle;
struct xenbus_device *dev = be->dev;
+ struct xenvif *vif;
if (be->vif != NULL)
return 0;
@@ -414,13 +415,13 @@ static int backend_create_xenvif(struct backend_info *be)
return (err < 0) ? err : -EINVAL;
}
- be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
- if (IS_ERR(be->vif)) {
- err = PTR_ERR(be->vif);
- be->vif = NULL;
+ vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
+ if (IS_ERR(vif)) {
+ err = PTR_ERR(vif);
xenbus_dev_fatal(dev, err, "creating interface");
return err;
}
+ be->vif = vif;
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
return 0;