FAILED: patch "[PATCH] fs: fix adding security options to statmount.mnt_opt" failed to apply to 6.13-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.13-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-6.13.y
git checkout FETCH_HEAD
git cherry-pick -x 5eb987105357cb7cfa7cf3b1e2f66d5c0977e412
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025021142-whoops-explicit-4d75@gregkh' --subject-prefix 'PATCH 6.13.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 5eb987105357cb7cfa7cf3b1e2f66d5c0977e412 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 29 Jan 2025 16:12:53 +0100
Subject: [PATCH] fs: fix adding security options to statmount.mnt_opt

Prepending security options was made conditional on sb->s_op->show_options,
but security options are independent of sb options.

Fixes: 056d33137bf9 ("fs: prepend statmount.mnt_opts string with security_sb_mnt_opts()")
Fixes: f9af549d1fd3 ("fs: export mount options via statmount()")
Cc: stable@vger.kernel.org # v6.11
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Link: https://lore.kernel.org/r/20250129151253.33241-1-mszeredi@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/namespace.c b/fs/namespace.c
index 9c4d307a82cd..8f1000f9f3df 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -5087,31 +5087,30 @@ static int statmount_mnt_opts(struct kstatmount *s, struct seq_file *seq)
 {
 	struct vfsmount *mnt = s->mnt;
 	struct super_block *sb = mnt->mnt_sb;
+	size_t start = seq->count;
 	int err;
 
+	err = security_sb_show_options(seq, sb);
+	if (err)
+		return err;
+
 	if (sb->s_op->show_options) {
-		size_t start = seq->count;
-
-		err = security_sb_show_options(seq, sb);
-		if (err)
-			return err;
-
 		err = sb->s_op->show_options(seq, mnt->mnt_root);
 		if (err)
 			return err;
-
-		if (unlikely(seq_has_overflowed(seq)))
-			return -EAGAIN;
-
-		if (seq->count == start)
-			return 0;
-
-		/* skip leading comma */
-		memmove(seq->buf + start, seq->buf + start + 1,
-			seq->count - start - 1);
-		seq->count--;
 	}
 
+	if (unlikely(seq_has_overflowed(seq)))
+		return -EAGAIN;
+
+	if (seq->count == start)
+		return 0;
+
+	/* skip leading comma */
+	memmove(seq->buf + start, seq->buf + start + 1,
+		seq->count - start - 1);
+	seq->count--;
+
 	return 0;
 }