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authorEric Dumazet <eric.dumazet@gmail.com>2009-10-19 06:41:58 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-19 21:34:20 -0700
commit55b8050353c4a212c94d7156e2bd5885225b869b (patch)
tree013778c4d48b946b2c565f8b55f40e505ec255ce /net/ipv6
parent45054dc1bf2367ccb0e7c0486037907cd9395f8b (diff)
downloadlinux-55b8050353c4a212c94d7156e2bd5885225b869b.tar.bz2
net: Fix IP_MULTICAST_IF
ipv4/ipv6 setsockopt(IP_MULTICAST_IF) have dubious __dev_get_by_index() calls. This function should be called only with RTNL or dev_base_lock held, or reader could see a corrupt hash chain and eventually enter an endless loop. Fix is to call dev_get_by_index()/dev_put(). If this happens to be performance critical, we could define a new dev_exist_by_index() function to avoid touching dev refcount. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ipv6_sockglue.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 14f54eb5a7fc..4f7aaf6996a3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -496,13 +496,17 @@ done:
goto e_inval;
if (val) {
+ struct net_device *dev;
+
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
goto e_inval;
- if (__dev_get_by_index(net, val) == NULL) {
+ dev = dev_get_by_index(net, val);
+ if (!dev) {
retv = -ENODEV;
break;
}
+ dev_put(dev);
}
np->mcast_oif = val;
retv = 0;