This is a note to let you know that I've just added the patch titled ipv6: fix memory leaks on IPV6_ADDRFORM path to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ipv6-fix-memory-leaks-on-ipv6_addrform-path.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Mon 10 Aug 2020 02:07:44 PM CEST From: Cong Wang <xiyou.wangcong@xxxxxxxxx> Date: Sat, 25 Jul 2020 15:40:53 -0700 Subject: ipv6: fix memory leaks on IPV6_ADDRFORM path From: Cong Wang <xiyou.wangcong@xxxxxxxxx> [ 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@xxxxxxxxx Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -273,6 +273,7 @@ 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 @@ -183,7 +183,7 @@ 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; @@ -191,10 +191,7 @@ 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; @@ -211,6 +208,16 @@ 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 @@ -205,6 +205,7 @@ 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 Patches currently in stable-queue which might be from xiyou.wangcong@xxxxxxxxx are queue-5.4/ipv6-fix-memory-leaks-on-ipv6_addrform-path.patch