[3.11.y.z extended stable] Patch "br: fix use of ->rx_handler_data in code executed on non-rx_handler" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Tue Jan 21 11:02:18 UTC 2014
This is a note to let you know that I have just added a patch titled
br: fix use of ->rx_handler_data in code executed on non-rx_handler
to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From f2adfce41efcd52d7e022773fd849bac032c81c9 Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri at resnulli.us>
Date: Thu, 5 Dec 2013 16:27:37 +0100
Subject: br: fix use of ->rx_handler_data in code executed on non-rx_handler
path
commit 859828c0ea476b42f3a93d69d117aaba90994b6f upstream.
br_stp_rcv() is reached by non-rx_handler path. That means there is no
guarantee that dev is bridge port and therefore simple NULL check of
->rx_handler_data is not enough. There is need to check if dev is really
bridge port and since only rcu read lock is held here, do it by checking
->rx_handler pointer.
Note that synchronize_net() in netdev_rx_handler_unregister() ensures
this approach as valid.
Introduced originally by:
commit f350a0a87374418635689471606454abc7beaa3a
"bridge: use rx_handler_data pointer to store net_bridge_port pointer"
Fixed but not in the best way by:
commit b5ed54e94d324f17c97852296d61a143f01b227a
"bridge: fix RCU races with bridge port"
Reintroduced by:
commit 716ec052d2280d511e10e90ad54a86f5b5d4dcc2
"bridge: fix NULL pointer deref of br_port_get_rcu"
Please apply to stable trees as well. Thanks.
RH bugzilla reference: https://bugzilla.redhat.com/show_bug.cgi?id=1025770
Reported-by: Laine Stump <laine at redhat.com>
Debugged-by: Michael S. Tsirkin <mst at redhat.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Signed-off-by: Jiri Pirko <jiri at resnulli.us>
Acked-by: Michael S. Tsirkin <mst at redhat.com>
Acked-by: Eric Dumazet <edumazet at google.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
net/bridge/br_private.h | 10 ++++++++++
net/bridge/br_stp_bpdu.c | 2 +-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index aa05bd8..a70bb90 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -452,6 +452,16 @@ extern netdev_features_t br_features_recompute(struct net_bridge *br,
extern int br_handle_frame_finish(struct sk_buff *skb);
extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
+static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
+{
+ return rcu_dereference(dev->rx_handler) == br_handle_frame;
+}
+
+static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
+{
+ return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
+}
+
/* br_ioctl.c */
extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 8660ea3..bdb459d 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -153,7 +153,7 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0)
goto err;
- p = br_port_get_rcu(dev);
+ p = br_port_get_check_rcu(dev);
if (!p)
goto err;
--
1.8.3.2
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