linux-kernel - [PATCH AUTOSEL 5.15 10/33] ksmbd: fix same UniqueId for dot and dotdot entries

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Date:   Tue, 15 Feb 2022 10:28:08 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, senozhatsky@...omium.org,
        sfrench@...ba.org, hyc.lee@...il.com, linux-cifs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 10/33] ksmbd: fix same UniqueId for dot and dotdot entries

From: Namjae Jeon <linkinjeon@...nel.org>

[ Upstream commit 97550c7478a2da93e348d8c3075d92cddd473a78 ]

ksmbd sets the inode number to UniqueId. However, the same UniqueId for
dot and dotdot entry is set to the inode number of the parent inode.
This patch set them using the current inode and parent inode.

Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ksmbd/smb_common.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index 707490ab1f4c4..f2e7e3a654b34 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -308,14 +308,17 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
 	for (i = 0; i < 2; i++) {
 		struct kstat kstat;
 		struct ksmbd_kstat ksmbd_kstat;
+		struct dentry *dentry;
 
 		if (!dir->dot_dotdot[i]) { /* fill dot entry info */
 			if (i == 0) {
 				d_info->name = ".";
 				d_info->name_len = 1;
+				dentry = dir->filp->f_path.dentry;
 			} else {
 				d_info->name = "..";
 				d_info->name_len = 2;
+				dentry = dir->filp->f_path.dentry->d_parent;
 			}
 
 			if (!match_pattern(d_info->name, d_info->name_len,
@@ -327,7 +330,7 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
 			ksmbd_kstat.kstat = &kstat;
 			ksmbd_vfs_fill_dentry_attrs(work,
 						    user_ns,
-						    dir->filp->f_path.dentry->d_parent,
+						    dentry,
 						    &ksmbd_kstat);
 			rc = fn(conn, info_level, d_info, &ksmbd_kstat);
 			if (rc)
-- 
2.34.1