diff options
| author |   Amerigo Wang <amwang@redhat.com> | 2012-08-10 01:24:40 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-08-14 14:33:31 -0700 |
| commit | 57c5d46191e75312934c00eba65b13a31ca95120 (patch) | |
| tree | 18eb9488b414f0dacdf7be468985a29ceeb1f2e9 | |
| parent | netconsole: do not release spin_lock when calling __netpoll_cleanup (diff) | |
| download | wireguard-linux-57c5d46191e75312934c00eba65b13a31ca95120.tar.xz wireguard-linux-57c5d46191e75312934c00eba65b13a31ca95120.zip | |
netpoll: take rcu_read_lock_bh() in netpoll_rx()
In __netpoll_rx(), it dereferences ->npinfo without rcu_dereference_bh(),
this patch fixes it by using the 'npinfo' passed from netpoll_rx()
where it is already dereferenced with rcu_dereference_bh().
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/netpoll.h | 4 | ||||
| -rw-r--r-- | net/core/netpoll.c | 3 |
2 files changed, 3 insertions, 4 deletions
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h index 907812efb4d9..5d881c388273 100644 --- a/include/linux/netpoll.h +++ b/include/linux/netpoll.h @@ -52,7 +52,7 @@ void netpoll_set_trap(int trap); void __netpoll_cleanup(struct netpoll *np); void __netpoll_free_rcu(struct netpoll *np); void netpoll_cleanup(struct netpoll *np); -int __netpoll_rx(struct sk_buff *skb); +int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo); void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, struct net_device *dev); static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) @@ -77,7 +77,7 @@ static inline bool netpoll_rx(struct sk_buff *skb) spin_lock(&npinfo->rx_lock); /* check rx_flags again with the lock held */ - if (npinfo->rx_flags && __netpoll_rx(skb)) + if (npinfo->rx_flags && __netpoll_rx(skb, npinfo)) ret = true; spin_unlock(&npinfo->rx_lock); diff --git a/net/core/netpoll.c b/net/core/netpoll.c index dc17f1db1479..d055bb01328b 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -543,13 +543,12 @@ static void arp_reply(struct sk_buff *skb) spin_unlock_irqrestore(&npinfo->rx_lock, flags); } -int __netpoll_rx(struct sk_buff *skb) +int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) { int proto, len, ulen; int hits = 0; const struct iphdr *iph; struct udphdr *uh; - struct netpoll_info *npinfo = skb->dev->npinfo; struct netpoll *np, *tmp; if (list_empty(&npinfo->rx_np)) |