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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-07-30 16:35:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-31 02:28:13 -0700 |
| commit | 7f988eab57bd22884bbc452fb04c6c18738666b3 (patch) | |
| tree | d679707a0251dc3d399de7e52c5499dff521c86e | |
| parent | 7ce1b0edcb11f90f6fc5e0ceecff467f329889a0 (diff) | |
| download | op-kernel-dev-7f988eab57bd22884bbc452fb04c6c18738666b3.zip op-kernel-dev-7f988eab57bd22884bbc452fb04c6c18738666b3.tar.gz | |
[NET]: Take dev_base_lock when moving device name hash list entry
When we added name-based hashing the dev_base_lock was designated as the
lock to take when changing the name hash list. Unfortunately, because
it was a preexisting lock that just happened to be taken in the right
spots we neglected to take it in dev_change_name.
The race can affect calles of __dev_get_by_name that do so without taking
the RTNL. They may end up walking down the wrong hash chain and end up
missing the device that they're looking for.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/dev.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 7bfea5e..346cbf6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -839,8 +839,12 @@ int dev_change_name(struct net_device *dev, char *newname) strlcpy(dev->name, newname, IFNAMSIZ); device_rename(&dev->dev, dev->name); + + write_lock_bh(&dev_base_lock); hlist_del(&dev->name_hlist); hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name)); + write_unlock_bh(&dev_base_lock); + raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev); return err; |
