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x25: Do not reference freed memory.

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commit 96642d42f076101ba98866363d908cab706d156c upstream.

In x25_link_free(), we destroy 'nb' before dereferencing
'nb->dev'.  Don't do this, because 'nb' might be freed
by then.

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Tested-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David S. Miller 2011-02-09 21:48:36 -08:00 committed by Greg Kroah-Hartman
parent cbc0238c26
commit 7599b39d52
1 changed files with 4 additions and 1 deletions
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5
net/x25/x25_link.c
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@ -391,9 +391,12 @@ void __exit x25_link_free(void)
write_lock_bh(&x25_neigh_list_lock);
list_for_each_safe(entry, tmp, &x25_neigh_list) {
struct net_device *dev;
nb = list_entry(entry, struct x25_neigh, node);
dev = nb->dev;
__x25_remove_neigh(nb);
dev_put(nb->dev);
dev_put(dev);
}
write_unlock_bh(&x25_neigh_list_lock);
}