There is no need trying to add any channels information in the nelink
message when the interface is being removed.
This fixes this kernel panic issue:
[ 6.275502] Call Trace:
[ 6.275690] [<ffffffff814e6044>] dump_stack+0x4e/0x71
[ 6.276069] [<ffffffff8108fbe1>] ? console_unlock+0x1f1/0x4d0
[ 6.276498] [<ffffffff81040bbc>] warn_slowpath_common+0x7c/0xa0
[ 6.276939] [<ffffffff81040cca>] warn_slowpath_null+0x1a/0x20
[ 6.277368] [<ffffffff813f9677>] nl80211_send_chandef+0x127/0x130
[ 6.277821] [<ffffffff813f9a35>] nl80211_send_iface+0x3b5/0x5e0
[ 6.278281] [<ffffffff813f9ccc>] nl80211_del_interface+0x6c/0x520
[ 6.278736] [<ffffffff8131b9a4>] genl_family_rcv_msg+0x194/0x330
[ 6.279183] [<ffffffff8131bb40>] ? genl_family_rcv_msg+0x330/0x330
[ 6.279644] [<ffffffff8131bbce>] genl_rcv_msg+0x8e/0xd0
[ 6.280047] [<ffffffff8131b081>] netlink_rcv_skb+0xb1/0xc0
[ 6.280679] [<ffffffff8131b7ed>] ? genl_rcv+0x1d/0x40
[ 6.281251] [<ffffffff8131b7fc>] genl_rcv+0x2c/0x40
[ 6.281797] [<ffffffff81319786>] netlink_unicast+0x156/0x230
[ 6.282355] [<ffffffff8131a0e0>] netlink_sendmsg+0x320/0x410
[ 6.282870] [<ffffffff812d6eb9>] sock_sendmsg+0x69/0x90
[ 6.283343] [<ffffffff812e5b66>] ? verify_iovec+0x56/0xe0
[ 6.283830] [<ffffffff812d71a8>] ___sys_sendmsg.part.38+0x2c8/0x2e0
[ 6.284373] [<ffffffff810889e0>] ? __lock_acquire+0x430/0xbd0
[ 6.284882] [<ffffffff81089aa0>] ? lock_release_non_nested+0xa0/0x300
[ 6.285425] [<ffffffff8111b18c>] ? might_fault+0x8c/0xa0
[ 6.285898] [<ffffffff8111b143>] ? might_fault+0x43/0xa0
[ 6.286384] [<ffffffff812d892e>] __sys_sendmsg+0x4e/0x90
[ 6.286849] [<ffffffff812d897e>] SyS_sendmsg+0xe/0x10
[ 6.287312] [<ffffffff814f0be9>] system_call_fastpath+0x12/0x17
Reported-by: Jouni Malinen <j@xxxxx>
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@xxxxxxxxxxxxxxx>
---
@Jouni: Thanks for finding the issue. Can you check this patch fixes it?
It seems to do the trick for me at least.
net/wireless/nl80211.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 6e41777..018f18d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2372,7 +2372,7 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
(cfg80211_rdev_list_generation << 2)))
goto nla_put_failure;
- if (rdev->ops->get_channel) {
+ if (!removal && rdev->ops->get_channel) {
int ret;
struct cfg80211_chan_def chandef;
--
2.0.4
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