linux-kernel - Re: [syzbot] [ntfs3?] general protection fault in pick

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Message-ID: <tencent_9967BB8933B49E4B1B104B091B6325E5BA08@qq.com>
Date: Wed, 18 Jun 2025 11:03:54 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+1aa90f0eb1fc3e77d969@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] general protection fault in pick_link (2)

#syz test

diff --git a/fs/namei.c b/fs/namei.c
index 4bb889fc980b..291f29a04e09 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2005,6 +2005,10 @@ static const char *step_into(struct nameidata *nd, int flags,
 		if (path.mnt == nd->path.mnt)
 			mntget(path.mnt);
 	}
+
+	if (inode && !S_ISLNK(inode->i_mode))
+		return NULL;
+
 	return pick_link(nd, &path, inode, flags);
 }