Patch "sctp: avoid BUG_ON on sctp_wait_for_sndbuf" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    sctp: avoid BUG_ON on sctp_wait_for_sndbuf

to the 4.4-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-avoid-bug_on-on-sctp_wait_for_sndbuf.patch
and it can be found in the queue-4.4 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 Tue Feb 14 16:29:59 PST 2017
From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Date: Mon, 6 Feb 2017 18:10:31 -0200
Subject: sctp: avoid BUG_ON on sctp_wait_for_sndbuf

From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>


[ Upstream commit 2dcab598484185dea7ec22219c76dcdd59e3cb90 ]

Alexander Popov reported that an application may trigger a BUG_ON in
sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is
waiting on it to queue more data and meanwhile another thread peels off
the association being used by the first thread.

This patch replaces the BUG_ON call with a proper error handling. It
will return -EPIPE to the original sendmsg call, similarly to what would
have been done if the association wasn't found in the first place.

Acked-by: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/socket.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6960,7 +6960,8 @@ static int sctp_wait_for_sndbuf(struct s
 		 */
 		release_sock(sk);
 		current_timeo = schedule_timeout(current_timeo);
-		BUG_ON(sk != asoc->base.sk);
+		if (sk != asoc->base.sk)
+			goto do_error;
 		lock_sock(sk);
 
 		*timeo_p = current_timeo;


Patches currently in stable-queue which might be from marcelo.leitner@gmail.com are

queue-4.4/sctp-avoid-bug_on-on-sctp_wait_for_sndbuf.patch