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[SCTP] ipv6: inconsistent lock state ipv6_add_addr/sctp_v6_copy_addrlist 

lockdep found that dev->lock taken from softirq in ipv6_add_addr
is also taken in sctp_v6_copy_addrlist with softirqs enabled, so
lockup is possible.

Noticed-by: Simon Arlott <simon@arlott.org>
Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2007-03-08 14:43:41 -08:00 committed by David S. Miller
parent ca4266359d
commit e2eb8d4528
1 changed files with 2 additions and 2 deletions
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4
net/sctp/ipv6.c
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@ -360,7 +360,7 @@ static void sctp_v6_copy_addrlist(struct list_head *addrlist,
return;
}
read_lock(&in6_dev->lock);
read_lock_bh(&in6_dev->lock);
for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
/* Add the address to the local list. */
addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
@ -374,7 +374,7 @@ static void sctp_v6_copy_addrlist(struct list_head *addrlist,
}
}
read_unlock(&in6_dev->lock);
read_unlock_bh(&in6_dev->lock);
rcu_read_unlock();
}