linux-kernel - [PATCH arm64] ntfs3: fix oob in ntfs

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Message-ID: <tencent_C51BB525D6BA72BB25338C9EB41B094B3608@qq.com>
Date: Sat, 30 Dec 2023 17:00:03 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+65e940cfb8f99a97aca7@...kaller.appspotmail.com
Cc: almaz.alexandrovich@...agon-software.com,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ntfs3@...ts.linux.dev,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH arm64] ntfs3: fix oob in ntfs_listxattr

The length of name cannot exceed the space occupied by ea.

Reported-and-tested-by: syzbot+65e940cfb8f99a97aca7@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 fs/ntfs3/xattr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 4274b6f31cfa..3b97508a7bf2 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -219,6 +219,9 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
 		if (!ea->name_len)
 			break;
 
+		if (ea->name_len > ea_size)
+			break;
+
 		if (buffer) {
 			/* Check if we can use field ea->name */
 			if (off + ea_size > size)
-- 
2.43.0