From: Namjae Jeon <linkinjeon@kernel.org>
Date: Fri, 25 Aug 2023 14:40:31 +0000 (+0900)
Subject: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
X-Git-Tag: v6.4.15~30
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4;p=thirdparty%2Fkernel%2Fstable.git

ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

commit 4b081ce0d830b684fdf967abc3696d1261387254 upstream.

If authblob->SessionKey.Length is bigger than session key
size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.
cifs_arc4_crypt copy to session key array from SessionKey from client.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21940
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/smb/server/auth.c b/fs/smb/server/auth.c
index 5e5e120edcc22..15e5684e328c1 100644
--- a/fs/smb/server/auth.c
+++ b/fs/smb/server/auth.c
@@ -355,6 +355,9 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
 		if (blob_len < (u64)sess_key_off + sess_key_len)
 			return -EINVAL;
 
+		if (sess_key_len > CIFS_KEY_SIZE)
+			return -EINVAL;
+
 		ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
 		if (!ctx_arc4)
 			return -ENOMEM;