From 6732badee0dad467fcc9dd0168af8677b2b1bc2f Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Tue, 27 Dec 2005 13:35:15 -0800 Subject: [PATCH] [IPV6]: Fix addrconf dead lock. We need to release idev->lcok before we call addrconf_dad_stop(). It calls ipv6_addr_del(), which will hold idev->lock. Bug spotted by Yasuyuki KOZAKAI . Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 2a6439e3c91c..a60585fd85ad 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2467,11 +2467,9 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) return; } - if (idev->if_flags & IF_READY) { - addrconf_dad_kick(ifp); - spin_unlock_bh(&ifp->lock); - } else { + if (!(idev->if_flags & IF_READY)) { spin_unlock_bh(&ifp->lock); + read_unlock_bh(&idev->lock); /* * If the defice is not ready: * - keep it tentative if it is a permanent address. @@ -2479,7 +2477,10 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) */ in6_ifa_hold(ifp); addrconf_dad_stop(ifp); + return; } + addrconf_dad_kick(ifp); + spin_unlock_bh(&ifp->lock); out: read_unlock_bh(&idev->lock); } -- 2.20.1