Commit 91e9c07b authored Nov 15, 2009 by Eric Dumazet Committed by David S. Miller Nov 16, 2009

net: Fix the rollback test in dev_change_name()



net: Fix the rollback test in dev_change_name()

In dev_change_name() an err variable is used for storing the original
call_netdevice_notifiers() errno (negative) and testing for a rollback
error later, but the test for non-zero is wrong, because the err might
have positive value as well - from dev_alloc_name(). It means the
rollback for a netdevice with a number > 0 will never happen. (The err
test is reordered btw. to make it more readable.)

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent e29d4363

net/core/dev.c

+6 −5

Original line number	Diff line number	Diff line
		@@ -942,14 +942,15 @@ rollback:
		ret = notifier_to_errno(ret);

		if (ret) {
		if (err) {
		printk(KERN_ERR
		"%s: name change rollback failed: %d.\n",
		dev->name, ret);
		} else {
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
		err = ret;
		memcpy(dev->name, oldname, IFNAMSIZ);
		goto rollback;
		} else {
		printk(KERN_ERR
		"%s: name change rollback failed: %d.\n",
		dev->name, ret);
		}
		}