As it noted in the comment before the br_handle_frame_finish
function, this function should be called under rcu_read_lock.
The problem callgraph:
br_dev_xmit -> br_nf_pre_routing_finish_bridge_slow ->
-> br_handle_frame_finish -> br_port_get_rcu -> rcu_dereference
And in this case there is no read-lock section.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Denis Efremov <yefremov.denis@xxxxxxxxx>
---
net/bridge/br_device.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 3334845..f9ae07f 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -33,7 +33,9 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
#ifdef CONFIG_BRIDGE_NETFILTER
if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
+ rcu_read_lock();
br_nf_pre_routing_finish_bridge_slow(skb);
+ rcu_read_unlock();
return NETDEV_TX_OK;
}
#endif
--
1.7.7
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