Patch "sctp: disable BH in sctp_for_each_endpoint" has been added to the 4.9-stable tree

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

sctp: disable BH in sctp_for_each_endpoint

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:
sctp-disable-bh-in-sctp_for_each_endpoint.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 <[email protected]> know about it.

From: Xin Long <[email protected]>
Date: Sat, 10 Jun 2017 14:48:14 +0800
Subject: sctp: disable BH in sctp_for_each_endpoint

From: Xin Long <[email protected]>

[ Upstream commit 581409dacc9176b0de1f6c4ca8d66e13aa8e1b29 ]

Now sctp holds read_lock when foreach sctp_ep_hashtable without disabling BH. If CPU schedules to another thread A at this moment, the thread A may be trying to hold the write_lock with disabling BH.

As BH is disabled and CPU cannot schedule back to the thread holding the read_lock, while the thread A keeps waiting for the read_lock. A dead lock would be triggered by this.

This patch is to fix this dead lock by calling read_lock_bh instead to disable BH when holding the read_lock in sctp_for_each_endpoint.

---
 net/sctp/socket.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -4460,13 +4460,13 @@ int sctp_for_each_endpoint(int (*cb)(str
 
 	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
 	     hash++, head++) {
-		read_lock(&head->lock);
+		read_lock_bh(&head->lock);
 		sctp_for_each_hentry(epb, &head->chain) {
 			err = cb(sctp_ep(epb), p);
 			if (err)
 				break;
 		}
-		read_unlock(&head->lock);
+		read_unlock_bh(&head->lock);
 	}
 
 	return err;

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

queue-4.9/ipv6-fix-calling-in6_ifa_hold-incorrectly-for-dad-work.patch queue-4.9/igmp-acquire-pmc-lock-for-ip_mc_clear_src.patch queue-4.9/sctp-return-next-obj-by-passing-pos-1-into-sctp_transport_get_idx.patch queue-4.9/sctp-disable-bh-in-sctp_for_each_endpoint.patch