This is a note to let you know that I've just added the patch titled
net: call cgroup_sk_alloc() earlier in sk_clone_lock()
to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Wed Nov 15 17:25:34 CET 2017
From: Eric Dumazet edumazet@google.com Date: Tue, 10 Oct 2017 19:12:33 -0700 Subject: net: call cgroup_sk_alloc() earlier in sk_clone_lock()
From: Eric Dumazet edumazet@google.com
[ Upstream commit c0576e3975084d4699b7bfef578613fb8e1144f6 ]
If for some reason, the newly allocated child need to be freed, we will call cgroup_put() (via sk_free_unlock_clone()) while the corresponding cgroup_get() was not yet done, and we will free memory too soon.
Fixes: d979a39d7242 ("cgroup: duplicate cgroup reference when cloning sockets") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Johannes Weiner hannes@cmpxchg.org Cc: Tejun Heo tj@kernel.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/core/sock.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/core/sock.c +++ b/net/core/sock.c @@ -1674,6 +1674,7 @@ struct sock *sk_clone_lock(const struct newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
sock_reset_flag(newsk, SOCK_DONE); + cgroup_sk_alloc(&newsk->sk_cgrp_data);
rcu_read_lock(); filter = rcu_dereference(sk->sk_filter); @@ -1706,8 +1707,6 @@ struct sock *sk_clone_lock(const struct atomic64_set(&newsk->sk_cookie, 0);
mem_cgroup_sk_alloc(newsk); - cgroup_sk_alloc(&newsk->sk_cgrp_data); - /* * Before updating sk_refcnt, we must commit prior changes to memory * (Documentation/RCU/rculist_nulls.txt for details)
Patches currently in stable-queue which might be from edumazet@google.com are
queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch