[PATCH] ksmbd: Fix an error handling path in 'smb2_sess_setup()'

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: linkinjeon@kernel.org, senozhatsky@chromium.org,
	sfrench@samba.org, hyc.lee@gmail.com, mmakassikis@freebox.fr
Cc: linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] ksmbd: Fix an error handling path in 'smb2_sess_setup()'
Date: Sun,  7 Nov 2021 16:22:57 +0100	[thread overview]
Message-ID: <17d0c2af6d0a35c2951f0ac5c7a1dfea04df410f.1636298480.git.christophe.jaillet@wanadoo.fr> (raw)

All the error handling paths of 'smb2_sess_setup()' end to 'out_err'.

All but the new error handling path added by the commit given in the Fixes
tag below.

Fix this error handling path and branch to 'out_err' as well.

Fixes: 0d994cd482ee ("ksmbd: add buffer validation in session setup")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 fs/ksmbd/smb2pdu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index ba68a27cabf8..bb0d1b155b34 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1698,8 +1698,10 @@ int smb2_sess_setup(struct ksmbd_work *work)
 	negblob_off = le16_to_cpu(req->SecurityBufferOffset);
 	negblob_len = le16_to_cpu(req->SecurityBufferLength);
 	if (negblob_off < offsetof(struct smb2_sess_setup_req, Buffer) ||
-	    negblob_len < offsetof(struct negotiate_message, NegotiateFlags))
-		return -EINVAL;
+	    negblob_len < offsetof(struct negotiate_message, NegotiateFlags)) {
+		rc = -EINVAL;
+		goto out_err;
+	}
 
 	negblob = (struct negotiate_message *)((char *)&req->hdr.ProtocolId +
 			negblob_off);
-- 
2.30.2

