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| author | Alexei Starovoitov | 2013-10-24 01:02:42 +0200 |
|---|---|---|
| committer | David S. Miller | 2013-10-26 01:03:45 +0200 |
| commit | 7f29405403d7c17f539c099987972b862e7e5255 (patch) | |
| tree | 22c5a8a78b275b6da6bbc5f31fa3273b441d85ab /net/core/dev.c | |
| parent | net: initialize hashrnd in flow_dissector with net_get_random_once (diff) | |
| download | kernel-qcow2-linux-7f29405403d7c17f539c099987972b862e7e5255.tar.gz kernel-qcow2-linux-7f29405403d7c17f539c099987972b862e7e5255.tar.xz kernel-qcow2-linux-7f29405403d7c17f539c099987972b862e7e5255.zip | |
net: fix rtnl notification in atomic context
commit 991fb3f74c "dev: always advertise rx_flags changes via netlink"
introduced rtnl notification from __dev_set_promiscuity(),
which can be called in atomic context.
Steps to reproduce:
ip tuntap add dev tap1 mode tap
ifconfig tap1 up
tcpdump -nei tap1 &
ip tuntap del dev tap1 mode tap
[ 271.627994] device tap1 left promiscuous mode
[ 271.639897] BUG: sleeping function called from invalid context at mm/slub.c:940
[ 271.664491] in_atomic(): 1, irqs_disabled(): 0, pid: 3394, name: ip
[ 271.677525] INFO: lockdep is turned off.
[ 271.690503] CPU: 0 PID: 3394 Comm: ip Tainted: G W 3.12.0-rc3+ #73
[ 271.703996] Hardware name: System manufacturer System Product Name/P8Z77 WS, BIOS 3007 07/26/2012
[ 271.731254] ffffffff81a58506 ffff8807f0d57a58 ffffffff817544e5 ffff88082fa0f428
[ 271.760261] ffff8808071f5f40 ffff8807f0d57a88 ffffffff8108bad1 ffffffff81110ff8
[ 271.790683] 0000000000000010 00000000000000d0 00000000000000d0 ffff8807f0d57af8
[ 271.822332] Call Trace:
[ 271.838234] [<ffffffff817544e5>] dump_stack+0x55/0x76
[ 271.854446] [<ffffffff8108bad1>] __might_sleep+0x181/0x240
[ 271.870836] [<ffffffff81110ff8>] ? rcu_irq_exit+0x68/0xb0
[ 271.887076] [<ffffffff811a80be>] kmem_cache_alloc_node+0x4e/0x2a0
[ 271.903368] [<ffffffff810b4ddc>] ? vprintk_emit+0x1dc/0x5a0
[ 271.919716] [<ffffffff81614d67>] ? __alloc_skb+0x57/0x2a0
[ 271.936088] [<ffffffff810b4de0>] ? vprintk_emit+0x1e0/0x5a0
[ 271.952504] [<ffffffff81614d67>] __alloc_skb+0x57/0x2a0
[ 271.968902] [<ffffffff8163a0b2>] rtmsg_ifinfo+0x52/0x100
[ 271.985302] [<ffffffff8162ac6d>] __dev_notify_flags+0xad/0xc0
[ 272.001642] [<ffffffff8162ad0c>] __dev_set_promiscuity+0x8c/0x1c0
[ 272.017917] [<ffffffff81731ea5>] ? packet_notifier+0x5/0x380
[ 272.033961] [<ffffffff8162b109>] dev_set_promiscuity+0x29/0x50
[ 272.049855] [<ffffffff8172e937>] packet_dev_mc+0x87/0xc0
[ 272.065494] [<ffffffff81732052>] packet_notifier+0x1b2/0x380
[ 272.080915] [<ffffffff81731ea5>] ? packet_notifier+0x5/0x380
[ 272.096009] [<ffffffff81761c66>] notifier_call_chain+0x66/0x150
[ 272.110803] [<ffffffff8108503e>] __raw_notifier_call_chain+0xe/0x10
[ 272.125468] [<ffffffff81085056>] raw_notifier_call_chain+0x16/0x20
[ 272.139984] [<ffffffff81620190>] call_netdevice_notifiers_info+0x40/0x70
[ 272.154523] [<ffffffff816201d6>] call_netdevice_notifiers+0x16/0x20
[ 272.168552] [<ffffffff816224c5>] rollback_registered_many+0x145/0x240
[ 272.182263] [<ffffffff81622641>] rollback_registered+0x31/0x40
[ 272.195369] [<ffffffff816229c8>] unregister_netdevice_queue+0x58/0x90
[ 272.208230] [<ffffffff81547ca0>] __tun_detach+0x140/0x340
[ 272.220686] [<ffffffff81547ed6>] tun_chr_close+0x36/0x60
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index bdffd654edc4..0054c8c75f50 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1203,7 +1203,7 @@ void netdev_state_change(struct net_device *dev) { if (dev->flags & IFF_UP) { call_netdevice_notifiers(NETDEV_CHANGE, dev); - rtmsg_ifinfo(RTM_NEWLINK, dev, 0); + rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); } } EXPORT_SYMBOL(netdev_state_change); @@ -1293,7 +1293,7 @@ int dev_open(struct net_device *dev) if (ret < 0) return ret; - rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); + rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); call_netdevice_notifiers(NETDEV_UP, dev); return ret; @@ -1371,7 +1371,7 @@ static int dev_close_many(struct list_head *head) __dev_close_many(head); list_for_each_entry_safe(dev, tmp, head, close_list) { - rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); + rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); call_netdevice_notifiers(NETDEV_DOWN, dev); list_del_init(&dev->close_list); } @@ -5258,7 +5258,7 @@ void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, unsigned int changes = dev->flags ^ old_flags; if (gchanges) - rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges); + rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); if (changes & IFF_UP) { if (dev->flags & IFF_UP) @@ -5490,7 +5490,7 @@ static void rollback_registered_many(struct list_head *head) if (!dev->rtnl_link_ops || dev->rtnl_link_state == RTNL_LINK_INITIALIZED) - rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); + rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); /* * Flush the unicast and multicast chains @@ -5889,7 +5889,7 @@ int register_netdevice(struct net_device *dev) */ if (!dev->rtnl_link_ops || dev->rtnl_link_state == RTNL_LINK_INITIALIZED) - rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); + rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); out: return ret; @@ -6501,7 +6501,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char call_netdevice_notifiers(NETDEV_UNREGISTER, dev); rcu_barrier(); call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); - rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); + rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); /* * Flush the unicast and multicast chains @@ -6540,7 +6540,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char * Prevent userspace races by waiting until the network * device is fully setup before sending notifications. */ - rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); + rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); synchronize_net(); err = 0; |