FAILED: patch "[PATCH] smb: client: fix file type corruption in" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] smb: client: fix file type corruption in" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 6bd360447941357e959414a525aa62576a448116
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026091632-favorable-freefall-74c4@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6bd360447941357e959414a525aa62576a448116 Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@manguebit.org>
Date: Sun, 6 Sep 2026 16:01:24 -0300
Subject: [PATCH] smb: client: fix file type corruption in
 cifs_reparse_point_to_fattr()

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_IFLNK == S_IFDIR | S_IFREG).

Clear S_IFMT before setting S_IFLNK for native and SMB1 symlinks.

Closes: https://sashiko.dev/#/patchset/20260906181540.647469-1-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

diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 616ca2dbfac4..b6bded042e78 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -1280,6 +1280,7 @@ bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
 		break;
 	case 0: /* SMB1 symlink */
 	case IO_REPARSE_TAG_SYMLINK:
+		fattr->cf_mode &= ~S_IFMT;
 		fattr->cf_mode |= S_IFLNK;
 		break;
 	default:

[PATCH 5.15.y] smb: client: fix file type corruption in cifs_reparse_point_to_fattr()

[Sasha Levin]

From: Paulo Alcantara <pc@manguebit.org>

[ Upstream commit 6bd360447941357e959414a525aa62576a448116 ]

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_IFLNK == S_IFDIR | S_IFREG).

Clear S_IFMT before setting S_IFLNK for native and SMB1 symlinks.

Closes: https://sashiko.dev/#/patchset/20260906181540.647469-1-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
[ Moved the fix from missing reparse.c to smb311_posix_info_to_fattr() in inode.c. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index bb0b172c5a74d..388904b6bc030 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -623,6 +623,7 @@ smb311_posix_info_to_fattr(struct cifs_fattr *fattr, struct smb311_posix_qinfo *
 	/* fattr->cf_rdev = le32_to_cpu(info->DeviceId); */
 
 	if (symlink) {
+		fattr->cf_mode &= ~S_IFMT;
 		fattr->cf_mode |= S_IFLNK;
 		fattr->cf_dtype = DT_LNK;
 	} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
-- 
2.53.0