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cifs: fix potential null pointer use in destroy_workqueue in init_cifs error path

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commit 193cc89ea0ca1da311877d2b4bb5e9f03bcc82a2 upstream.

Dan Carpenter reported a Smack static checker warning:
   fs/smb/client/cifsfs.c:1981 init_cifs()
   error: we previously assumed 'serverclose_wq' could be null (see line 1895)

The patch which introduced the serverclose workqueue used the wrong
oredering in error paths in init_cifs() for freeing it on errors.

Fixes: 173217bd7336 ("smb3: retrying on failed server close")
Cc: stable@vger.kernel.org
Cc: Ritvik Budhiraja <rbudhiraja@microsoft.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: David Howells <dhowell@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steve French
2024-07-21 15:45:56 -05:00
committed by Greg Kroah-Hartman
parent 74b91a689b
commit 6018971710
1 changed files with 4 additions and 4 deletions
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8
fs/smb/client/cifsfs.c
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@@ -1872,12 +1872,12 @@ init_cifs(void)
WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
if (!serverclose_wq) { if (!serverclose_wq) {
rc = -ENOMEM; rc = -ENOMEM;
goto out_destroy_serverclose_wq; goto out_destroy_deferredclose_wq;
} }
rc = cifs_init_inodecache(); rc = cifs_init_inodecache();
if (rc) if (rc)
goto out_destroy_deferredclose_wq; goto out_destroy_serverclose_wq;
rc = init_mids(); rc = init_mids();
if (rc) if (rc)
@@ -1939,6 +1939,8 @@ out_destroy_mids:
destroy_mids(); destroy_mids();
out_destroy_inodecache: out_destroy_inodecache:
cifs_destroy_inodecache(); cifs_destroy_inodecache();
out_destroy_serverclose_wq:
destroy_workqueue(serverclose_wq);
out_destroy_deferredclose_wq: out_destroy_deferredclose_wq:
destroy_workqueue(deferredclose_wq); destroy_workqueue(deferredclose_wq);
out_destroy_cifsoplockd_wq: out_destroy_cifsoplockd_wq:
@@ -1949,8 +1951,6 @@ out_destroy_decrypt_wq:
destroy_workqueue(decrypt_wq); destroy_workqueue(decrypt_wq);
out_destroy_cifsiod_wq: out_destroy_cifsiod_wq:
destroy_workqueue(cifsiod_wq); destroy_workqueue(cifsiod_wq);
out_destroy_serverclose_wq:
destroy_workqueue(serverclose_wq);
out_clean_proc: out_clean_proc:
cifs_proc_clean(); cifs_proc_clean();
return rc; return rc;