linux-kernel - [PATCH 7/7] cifs: Validate content of WSL reparse point buffers

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Message-Id: <20241006100046.30772-8-pali@kernel.org>
Date: Sun,  6 Oct 2024 12:00:46 +0200
From: Pali Rohár <pali@...nel.org>
To: Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>,
	Ronnie Sahlberg <ronniesahlberg@...il.com>
Cc: linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] cifs: Validate content of WSL reparse point buffers

WSL socket, fifo, char and block devices have empty reparse buffer.
Validate the length of the reparse buffer.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 fs/smb/client/reparse.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 6606c40487ae..c0d9ba14a60d 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -1093,6 +1093,11 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
 	case IO_REPARSE_TAG_LX_FIFO:
 	case IO_REPARSE_TAG_LX_CHR:
 	case IO_REPARSE_TAG_LX_BLK:
+		if (le16_to_cpu(buf->ReparseDataLength) != 0) {
+			cifs_dbg(VFS, "srv returned malformed buffer for reparse point: 0x%08x\n",
+				 le32_to_cpu(buf->ReparseTag));
+			return -EIO;
+		}
 		break;
 	default:
 		cifs_tcon_dbg(VFS | ONCE, "unhandled reparse tag: 0x%08x\n",
-- 
2.20.1