From dc8482926e2b1006ed6962ac8388cb92aed4efc7 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Mon, 24 Jun 2013 21:42:40 +0200 Subject: [PATCH] ipv6: check return value of ipv6_get_lladdr We should check the return value of ipv6_get_lladdr in inet6_set_iftoken. A possible situation, which could leave ll_addr unassigned is, when the user removed her link-local address but a global scoped address was already set. In this case the interface would still be IF_READY and not dead. In that case the RS source address is some value from the stack. v2: Daniel Borkmann noted a small indent inconstancy; no semantic changes. Cc: Daniel Borkmann Acked-by: Daniel Borkmann Reviewed-by: Flavio Leitner Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 77b626136c23..4ab4c38958c6 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4306,6 +4306,7 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) struct inet6_ifaddr *ifp; struct net_device *dev = idev->dev; bool update_rs = false; + struct in6_addr ll_addr; if (token == NULL) return -EINVAL; @@ -4325,11 +4326,9 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) write_unlock_bh(&idev->lock); - if (!idev->dead && (idev->if_flags & IF_READY)) { - struct in6_addr ll_addr; - - ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | - IFA_F_OPTIMISTIC); + if (!idev->dead && (idev->if_flags & IF_READY) && + !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | + IFA_F_OPTIMISTIC)) { /* If we're not ready, then normal ifup will take care * of this. Otherwise, we need to request our rs here. -- 2.20.1