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authorLinus Lüssing <linus.luessing@web.de>2011-03-22 14:40:32 +0300
committerDavid S. Miller <davem@davemloft.net>2011-03-23 05:26:42 +0300
commita7bff75b087e7a355838a32efe61707cfa73c194 (patch)
tree4e87f5cb94772624b1f035baefb7a6c21586984d /net
parent6a1fef6d000944911df0f160f366111daa10740a (diff)
downloadlinux-a7bff75b087e7a355838a32efe61707cfa73c194.tar.xz
bridge: Fix possibly wrong MLD queries' ethernet source address
The ipv6_dev_get_saddr() is currently called with an uninitialized destination address. Although in tests it usually seemed to nevertheless always fetch the right source address, there seems to be a possible race condition. Therefore this commit changes this, first setting the destination address and only after that fetching the source address. Reported-by: Jan Beulich <JBeulich@novell.com> Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_multicast.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 030a002ff8ee..f61eb2eff3fd 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -445,9 +445,9 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
ip6h->payload_len = htons(8 + sizeof(*mldq));
ip6h->nexthdr = IPPROTO_HOPOPTS;
ip6h->hop_limit = 1;
+ ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
&ip6h->saddr);
- ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
hopopt = (u8 *)(ip6h + 1);