linux-kernel - [PATCH AUTOSEL 6.1 09/47] ksmbd: fix out of bounds in smb3_decrypt

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Message-Id: <20230813160006.1073695-9-sashal@kernel.org>
Date:   Sun, 13 Aug 2023 11:59:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Namjae Jeon <linkinjeon@...nel.org>,
        zdi-disclosures@...ndmicro.com,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, sfrench@...ba.org,
        linux-cifs@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 09/47] ksmbd: fix out of bounds in smb3_decrypt_req()

From: Namjae Jeon <linkinjeon@...nel.org>

[ Upstream commit dc318846f3dd54574a36ae97fc8d8b75dd7cdb1e ]

smb3_decrypt_req() validate if pdu_length is smaller than
smb2_transform_hdr size.

Reported-by: zdi-disclosures@...ndmicro.com # ZDI-CAN-21589
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/smb/server/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 26cf73d664f94..c33249393ef36 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -8706,7 +8706,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
 	struct smb2_transform_hdr *tr_hdr = smb2_get_msg(buf);
 	int rc = 0;
 
-	if (buf_data_size < sizeof(struct smb2_hdr)) {
+	if (pdu_length < sizeof(struct smb2_transform_hdr) ||
+	    buf_data_size < sizeof(struct smb2_hdr)) {
 		pr_err("Transform message is too small (%u)\n",
 		       pdu_length);
 		return -ECONNABORTED;
-- 
2.40.1