This is a note to let you know that I've just added the patch titled net: properly release sk_frag.page to the 4.9-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: net-properly-release-sk_frag.page.patch and it can be found in the queue-4.9 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 Mar 27 18:17:54 CEST 2017 From: Eric Dumazet <edumazet@xxxxxxxxxx> Date: Wed, 15 Mar 2017 13:21:28 -0700 Subject: net: properly release sk_frag.page From: Eric Dumazet <edumazet@xxxxxxxxxx> [ Upstream commit 22a0e18eac7a9e986fec76c60fa4a2926d1291e2 ] I mistakenly added the code to release sk->sk_frag in sk_common_release() instead of sk_destruct() TCP sockets using sk->sk_allocation == GFP_ATOMIC do no call sk_common_release() at close time, thus leaking one (order-3) page. iSCSI is using such sockets. Fixes: 5640f7685831 ("net: use a per task frag allocator") Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/core/sock.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1437,6 +1437,11 @@ static void __sk_destruct(struct rcu_hea pr_debug("%s: optmem leakage (%d bytes) detected\n", __func__, atomic_read(&sk->sk_omem_alloc)); + if (sk->sk_frag.page) { + put_page(sk->sk_frag.page); + sk->sk_frag.page = NULL; + } + if (sk->sk_peer_cred) put_cred(sk->sk_peer_cred); put_pid(sk->sk_peer_pid); @@ -2738,11 +2743,6 @@ void sk_common_release(struct sock *sk) sk_refcnt_debug_release(sk); - if (sk->sk_frag.page) { - put_page(sk->sk_frag.page); - sk->sk_frag.page = NULL; - } - sock_put(sk); } EXPORT_SYMBOL(sk_common_release); Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are queue-4.9/ipv4-provide-stronger-user-input-validation-in-nl_fib_input.patch queue-4.9/tcp-initialize-icsk_ack.lrcvtime-at-session-start-time.patch queue-4.9/net-properly-release-sk_frag.page.patch