linux-kernel - [PATCH 4.18 111/135] afs: Fix afs

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Message-Id: <20181016170523.002988446@linuxfoundation.org>
Date:   Tue, 16 Oct 2018 19:05:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH 4.18 111/135] afs: Fix afs_server struct leak

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@...hat.com>

commit f014ffb025c159fd51d19af8af0022a991aaa4f8 upstream.

Fix a leak of afs_server structs.  The routine that installs them in the
various lookup lists and trees gets a ref on leaving the function, whether
it added the server or a server already exists.  It shouldn't increment
the refcount if it added the server.

The effect of this that "rmmod kafs" will hang waiting for the leaked
server to become unused.

Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/afs/server.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -199,9 +199,11 @@ static struct afs_server *afs_install_se
 
 	write_sequnlock(&net->fs_addr_lock);
 	ret = 0;
+	goto out;
 
 exists:
 	afs_get_server(server);
+out:
 	write_sequnlock(&net->fs_lock);
 	return server;
 }