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Subject[PATCH 061/173] x25: Do not reference freed memory.
2.6.27.59-stable review patch.  If anyone has any objections, please let us know.

------------------
From: David S. Miller <davem@davemloft.net>

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>

---
net/x25/x25_link.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -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);
}



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