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| author |   Jan Beulich <JBeulich@suse.com> | 2014-12-09 11:47:04 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-12-09 18:30:08 -0500 |
| commit | f15650b7f94879667f253bc32de7431c1baf2d6e (patch) | |
| tree | 6f4f05da21227b0d2cbd93694f5b6dce8ce4b413 | |
| parent | Merge tag 'linux-can-fixes-for-3.18-20141207' of git://gitorious.org/linux-can/linux-can (diff) | |
| download | linux-dev-f15650b7f94879667f253bc32de7431c1baf2d6e.tar.xz linux-dev-f15650b7f94879667f253bc32de7431c1baf2d6e.zip | |
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>
| -rw-r--r-- | drivers/net/xen-netback/xenbus.c | 9 |
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; |