From 193cc89ea0ca1da311877d2b4bb5e9f03bcc82a2 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@microsoft.com>
Date: Sun, 21 Jul 2024 15:45:56 -0500
Subject: [PATCH] cifs: fix potential null pointer use in destroy_workqueue in
init_cifs error path
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>
---
fs/smb/client/cifsfs.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index c92937bed1331..2c4b357d85e22 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -1894,12 +1894,12 @@ init_cifs(void)
WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
if (!serverclose_wq) {
rc = -ENOMEM;
- goto out_destroy_serverclose_wq;
+ goto out_destroy_deferredclose_wq;
}
rc = cifs_init_inodecache();
if (rc)
- goto out_destroy_deferredclose_wq;
+ goto out_destroy_serverclose_wq;
rc = cifs_init_netfs();
if (rc)
@@ -1967,6 +1967,8 @@ init_cifs(void)
cifs_destroy_netfs();
out_destroy_inodecache:
cifs_destroy_inodecache();
+out_destroy_serverclose_wq:
+ destroy_workqueue(serverclose_wq);
out_destroy_deferredclose_wq:
destroy_workqueue(deferredclose_wq);
out_destroy_cifsoplockd_wq:
@@ -1977,8 +1979,6 @@ init_cifs(void)
destroy_workqueue(decrypt_wq);
out_destroy_cifsiod_wq:
destroy_workqueue(cifsiod_wq);
-out_destroy_serverclose_wq:
- destroy_workqueue(serverclose_wq);
out_clean_proc:
cifs_proc_clean();
return rc;
--
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