linux-kernel - Re: [syzbot] [ntfs3?] WARNING in ntfs_extend_initialized

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Message-ID: <tencent_B3968DE192105D945D9F997D4FE88DAE2507@qq.com>
Date: Mon,  7 Oct 2024 12:27:44 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+e37dd1dfc814b10caa55@...kaller.appspotmail.com
Cc: almaz.alexandrovich@...agon-software.com,
	linux-kernel@...r.kernel.org,
	ntfs3@...ts.linux.dev,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] WARNING in ntfs_extend_initialized_size

The data type of in->i_valid and to is u64 in ntfs_file_mmap(). 
If their values are greater than LLONG_MAX, overflow will occur because
the data types of the parameters valid and new_valid corresponding to
the function ntfs_extend_initialized_size() are loff_t.

#syz test

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 6202895a4542..c42454a62314 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -178,7 +178,6 @@ static int ntfs_extend_initialized_size(struct file *file,
 	}
 
 	WARN_ON(is_compressed(ni));
-	WARN_ON(valid >= new_valid);
 
 	for (;;) {
 		u32 zerofrom, len;
@@ -400,6 +399,7 @@ static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 	}
 
 	if (extend_init && !is_compressed(ni)) {
+		WARN_ON(ni->i_valid >= pos);
 		err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 		if (err)
 			goto out;