linux-kernel - [PATCH 3.10 178/250] net: properly release sk

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Message-Id: <1496876436-32402-179-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:59:24 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Eric Dumazet <edumazet@...gle.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 178/250] net: properly release sk_frag.page

From: Eric Dumazet <edumazet@...gle.com>

commit 22a0e18eac7a9e986fec76c60fa4a2926d1291e2 upstream.

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@...gle.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/core/sock.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index e3cb454..96e1259 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1403,6 +1403,11 @@ static void __sk_free(struct sock *sk)
 		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);
@@ -2556,11 +2561,6 @@ 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);
-- 
2.8.0.rc2.1.gbe9624a