From: Cong Wang xiyou.wangcong@gmail.com
[ Upstream commit 8c0de6e96c9794cb523a516c465991a70245da1c ]
IPV6_ADDRFORM causes resource leaks when converting an IPv6 socket to IPv4, particularly struct ipv6_ac_socklist. Similar to struct ipv6_mc_socklist, we should just close it on this path.
This bug can be easily reproduced with the following C program:
#include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h>
int main() { int s, value; struct sockaddr_in6 addr; struct ipv6_mreq m6;
s = socket(AF_INET6, SOCK_DGRAM, 0); addr.sin6_family = AF_INET6; addr.sin6_port = htons(5000); inet_pton(AF_INET6, "::ffff:192.168.122.194", &addr.sin6_addr); connect(s, (struct sockaddr *)&addr, sizeof(addr));
inet_pton(AF_INET6, "fe80::AAAA", &m6.ipv6mr_multiaddr); m6.ipv6mr_interface = 5; setsockopt(s, SOL_IPV6, IPV6_JOIN_ANYCAST, &m6, sizeof(m6));
value = AF_INET; setsockopt(s, SOL_IPV6, IPV6_ADDRFORM, &value, sizeof(value));
close(s); return 0; }
Reported-by: ch3332xr@gmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/addrconf.h | 1 + net/ipv6/anycast.c | 17 ++++++++++++----- net/ipv6/ipv6_sockglue.c | 1 + 3 files changed, 14 insertions(+), 5 deletions(-)
--- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -253,6 +253,7 @@ int ipv6_sock_ac_join(struct sock *sk, i const struct in6_addr *addr); int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr); +void __ipv6_sock_ac_close(struct sock *sk); void ipv6_sock_ac_close(struct sock *sk);
int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); --- a/net/ipv6/anycast.c +++ b/net/ipv6/anycast.c @@ -170,7 +170,7 @@ int ipv6_sock_ac_drop(struct sock *sk, i return 0; }
-void ipv6_sock_ac_close(struct sock *sk) +void __ipv6_sock_ac_close(struct sock *sk) { struct ipv6_pinfo *np = inet6_sk(sk); struct net_device *dev = NULL; @@ -178,10 +178,7 @@ void ipv6_sock_ac_close(struct sock *sk) struct net *net = sock_net(sk); int prev_index;
- if (!np->ipv6_ac_list) - return; - - rtnl_lock(); + ASSERT_RTNL(); pac = np->ipv6_ac_list; np->ipv6_ac_list = NULL;
@@ -198,6 +195,16 @@ void ipv6_sock_ac_close(struct sock *sk) sock_kfree_s(sk, pac, sizeof(*pac)); pac = next; } +} + +void ipv6_sock_ac_close(struct sock *sk) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + + if (!np->ipv6_ac_list) + return; + rtnl_lock(); + __ipv6_sock_ac_close(sk); rtnl_unlock(); }
--- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -206,6 +206,7 @@ static int do_ipv6_setsockopt(struct soc
fl6_free_socklist(sk); __ipv6_sock_mc_close(sk); + __ipv6_sock_ac_close(sk);
/* * Sock is moving from IPv6 to IPv4 (sk_prot), so