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authorDavid S. Miller <davem@davemloft.net>2011-02-09 21:48:36 -0800
committerDavid S. Miller <davem@davemloft.net>2011-02-09 22:36:13 -0800
commit96642d42f076101ba98866363d908cab706d156c (patch)
tree07043558ca37f51e072cf32c0a3a7db05dd91ce7
parentebc02e9c524e9ff377dd8a3820522d381adf19c8 (diff)
x25: Do not reference freed memory.
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>
-rw-r--r--net/x25/x25_link.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index 4cbc942f762a..21306928d47f 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -396,9 +396,12 @@ 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);
}