diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2010-05-18 15:56:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-18 15:56:06 -0700 |
| commit | 622ccdf107bcb49c4d8fb65512652566d4c8928a (patch) | |
| tree | b25ec5eaade9307a516c87f49f091af25e134590 | |
| parent | f2344a131bccdbfc5338e17fa71a807dee7944fa (diff) | |
| download | linux-622ccdf107bcb49c4d8fb65512652566d4c8928a.tar.gz linux-622ccdf107bcb49c4d8fb65512652566d4c8928a.tar.bz2 linux-622ccdf107bcb49c4d8fb65512652566d4c8928a.zip | |
ipv6: Never schedule DAD timer on dead address
This patch ensures that all places that schedule the DAD timer
look at the address state in a safe manner before scheduling the
timer. This ensures that we don't end up with pending timers
after deleting an address.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/addrconf.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 7c769fa81d97..e1a698df5706 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2853,10 +2853,10 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) net_srandom(ifp->addr.s6_addr32[3]); read_lock_bh(&idev->lock); + spin_lock(&ifp->lock); if (ifp->state == INET6_IFADDR_STATE_DEAD) goto out; - spin_lock(&ifp->lock); if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || idev->cnf.accept_dad < 1 || !(ifp->flags&IFA_F_TENTATIVE) || @@ -2890,8 +2890,8 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) ip6_ins_rt(ifp->rt); addrconf_dad_kick(ifp); - spin_unlock(&ifp->lock); out: + spin_unlock(&ifp->lock); read_unlock_bh(&idev->lock); } @@ -2911,6 +2911,12 @@ static void addrconf_dad_timer(unsigned long data) } spin_lock(&ifp->lock); + if (ifp->state == INET6_IFADDR_STATE_DEAD) { + spin_unlock(&ifp->lock); + read_unlock(&idev->lock); + goto out; + } + if (ifp->probes == 0) { /* * DAD was successful |