linux-kernel - Re: [syzbot] possible fix (linux-ntfs3)

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Message-ID: <000000000000aa39df0621be8870@google.com>
Date: Tue, 10 Sep 2024 00:08:00 -0700
From: syzbot <syzbot+4d2aaeff9eb5a2cfec70@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible fix (linux-ntfs3)

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: possible fix (linux-ntfs3)
Author: almaz.alexandrovich@...agon-software.com

#syz test: https://github.com/Paragon-Software-Group/linux-ntfs3.git master

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 128d49512f5d..4a2062e481a4 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -124,10 +124,15 @@ void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
 		struct dentry *de = d_find_alias(inode);
 
 		if (de) {
+			int len;
 			spin_lock(&de->d_lock);
-			snprintf(name, sizeof(s_name_buf), " \"%s\"",
-				 de->d_name.name);
+			len = snprintf(name, sizeof(s_name_buf), " \"%s\"",
+				       de->d_name.name);
 			spin_unlock(&de->d_lock);
+			if (len <= 0)
+				name[0] = 0;
+			else if (len >= sizeof(s_name_buf))
+				name[sizeof(s_name_buf) - 1] = 0;
 		} else {
 			name[0] = 0;
 		}