cifs: if deferred close is disabled then close files immediately

jira VULN-131073
cve-pre CVE-2025-38527
commit-author Bharath SM <bharathsm@microsoft.com>
commit df9d70c

If defer close timeout value is set to 0, then there is no
need to include files in the deferred close list and utilize
the delayed worker for closing. Instead, we can close them
immediately.

	Signed-off-by: Bharath SM <bharathsm@microsoft.com>
	Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
	Cc: stable@vger.kernel.org
	Signed-off-by: Steve French <stfrench@microsoft.com>
(cherry picked from commit df9d70c)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Author: bmastbergen

fs/cifs/file.c

@@ -948,8 +948,8 @@ int cifs_close(struct inode *inode, struct file *file)
 		cfile = file->private_data;
 		file->private_data = NULL;
 		dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL);
-		if ((cinode->oplock == CIFS_CACHE_RHW_FLG) &&
-		    cinode->lease_granted &&
+		if ((cifs_sb->ctx->closetimeo && cinode->oplock == CIFS_CACHE_RHW_FLG)
+		    && cinode->lease_granted &&
 		    !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) &&
 		    dclose) {
 			if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {