Patch "cifs: release cifs root_cred after exit_cifs" has been added to the 4.13-stable tree

Patch "cifs: release cifs root_cred after exit_cifs" has been added to the 4.13-stable tree

[gregkh]

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

    cifs: release cifs root_cred after exit_cifs

to the 4.13-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:
     cifs-release-cifs-root_cred-after-exit_cifs.patch
and it can be found in the queue-4.13 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 94183331e815617246b1baa97e0916f358c794bb Mon Sep 17 00:00:00 2001
From: Shu Wang <shuwang@redhat.com>
Date: Thu, 7 Sep 2017 16:03:27 +0800
Subject: cifs: release cifs root_cred after exit_cifs

From: Shu Wang <shuwang@redhat.com>

commit 94183331e815617246b1baa97e0916f358c794bb upstream.

memory leak was found by kmemleak. exit_cifs_spnego
should be called before cifs module removed, or
cifs root_cred will not be released.

kmemleak report:
unreferenced object 0xffff880070a3ce40 (size 192):
  backtrace:
     kmemleak_alloc+0x4a/0xa0
     kmem_cache_alloc+0xc7/0x1d0
     prepare_kernel_cred+0x20/0x120
     init_cifs_spnego+0x2d/0x170 [cifs]
     0xffffffffc07801f3
     do_one_initcall+0x51/0x1b0
     do_init_module+0x60/0x1fd
     load_module+0x161e/0x1b60
     SYSC_finit_module+0xa9/0x100
     SyS_finit_module+0xe/0x10

Signed-off-by: Shu Wang <shuwang@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/cifsfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1447,7 +1447,7 @@ exit_cifs(void)
 	exit_cifs_idmap();
 #endif
 #ifdef CONFIG_CIFS_UPCALL
-	unregister_key_type(&cifs_spnego_key_type);
+	exit_cifs_spnego();
 #endif
 	cifs_destroy_request_bufs();
 	cifs_destroy_mids();


Patches currently in stable-queue which might be from shuwang@redhat.com are

queue-4.13/cifs-release-cifs-root_cred-after-exit_cifs.patch
queue-4.13/cifs-release-auth_key.response-for-reconnect.patch