Patch "inet: fix races in reqsk_queue_hash_req()" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

inet: fix races in reqsk_queue_hash_req()

to the 4.2-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:
inet-fix-races-in-reqsk_queue_hash_req.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eric Dumazet <[email protected]>
Date: Sat, 19 Sep 2015 09:48:04 -0700
Subject: inet: fix races in reqsk_queue_hash_req()

From: Eric Dumazet <[email protected]>

[ Upstream commit 29c6852602e259d2c1882f320b29d5c3fec0de04 ]

Before allowing lockless LISTEN processing, we need to make sure to arm the SYN_RECV timer before the req socket is visible in hash tables.

Also, req->rsk_hash should be written before we set rsk_refcnt to a non zero value.

---
 net/ipv4/inet_connection_sock.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -685,20 +685,20 @@ void reqsk_queue_hash_req(struct request
 	req->num_timeout = 0;
 	req->sk = NULL;
 
+	setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
+	mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
+	req->rsk_hash = hash;
+
 	/* before letting lookups find us, make sure all req fields
 	 * are committed to memory and refcnt initialized.
 	 */
 	smp_wmb();
 	atomic_set(&req->rsk_refcnt, 2);
-	setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
-	req->rsk_hash = hash;
 
 	spin_lock(&queue->syn_wait_lock);
 	req->dl_next = lopt->syn_table[hash];
 	lopt->syn_table[hash] = req;
 	spin_unlock(&queue->syn_wait_lock);
-
-	mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
 }
 EXPORT_SYMBOL(reqsk_queue_hash_req);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/inet-fix-races-in-reqsk_queue_hash_req.patch queue-4.2/net-add-pfmemalloc-check-in-sk_add_backlog.patch queue-4.2/inet-fix-race-in-reqsk_queue_unlink.patch queue-4.2/net-unix-fix-logic-about-sk_peek_offset.patch queue-4.2/act_mirred-clear-sender-cpu-before-sending-to-tx.patch