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cifs: release cifs root_cred after exit_cifs 

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>
CC: Stable <stable@vger.kernel.org>
This commit is contained in:
Shu Wang 2017-09-07 16:03:27 +08:00 committed by Steve French
parent 4d61eda812
commit 94183331e8
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/cifsfs.c
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@ -1449,7 +1449,7 @@ 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();