From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Namjae Jeon <linkinjeon@kernel.org>,
	Paulo Alcantara <pc@manguebit.org>,
	Ronnie Sahlberg <ronniesahlberg@gmail.com>,
	Shyam Prasad N <sprasad@microsoft.com>,
	Tom Talpey <tom@talpey.com>,
	Bharath SM <bharathsm@microsoft.com>
Subject: [PATCH 6.18 1084/1250] smb: client: fix file type corruption in wsl_to_fattr()
Date: Thu, 17 Sep 2026 16:14:39 +0100
Message-ID: <20260917151621.534786381@linuxfoundation.org>
In-Reply-To: <20260917151551.901433442@linuxfoundation.org>
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6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paulo Alcantara <pc@manguebit.org>

commit fa7a2cfcf1e6117fc478cae6809c66c518740969 upstream.

Setting the file type in cf_mode without clearing the existing S_IFMT
bits first is wrong as it corrupts the file type when cf_mode already
has type bits set (e.g. S_IFREG | S_IFCHR == S_IFLNK).

Clear S_IFMT before the switch statement.

Closes: https://sashiko.dev/#/patchset/20260906172005.627163-1-pc%40manguebit.org
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Bharath SM <bharathsm@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/smb/client/reparse.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -1113,6 +1113,7 @@ static bool wsl_to_fattr(struct cifs_ope
 	bool have_xattr_dev = false;
 	u32 next = 0;
 
+	fattr->cf_mode &= ~S_IFMT;
 	switch (tag) {
 	case IO_REPARSE_TAG_LX_SYMLINK:
 		fattr->cf_mode |= S_IFLNK;