linux-kernel - [PATCH AUTOSEL 6.1 12/28] fs/ntfs3: Fix oob in ntfs

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Message-ID: <20240213002235.671934-12-sashal@kernel.org>
Date: Mon, 12 Feb 2024 19:22:10 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Edward Adam Davis <eadavis@...com>,
	syzbot+65e940cfb8f99a97aca7@...kaller.appspotmail.com,
	Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
	Sasha Levin <sashal@...nel.org>,
	ntfs3@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.1 12/28] fs/ntfs3: Fix oob in ntfs_listxattr

From: Edward Adam Davis <eadavis@...com>

[ Upstream commit 731ab1f9828800df871c5a7ab9ffe965317d3f15 ]

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>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ntfs3/xattr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index df15e00c2a3a..d98cf7b382bc 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -217,6 +217,9 @@ 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