linux-hardening - [PATCH][next] ksmbd: Use struct_size() helper in ksmbd_negotiate_smb

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Message-ID: <ZJNrsjDEfe0iwQ92@work>
Date:   Wed, 21 Jun 2023 15:29:22 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <sfrench@...ba.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Tom Talpey <tom@...pey.com>
Cc:     linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] ksmbd: Use struct_size() helper in
 ksmbd_negotiate_smb_dialect()

Prefer struct_size() over open-coded versions.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 fs/smb/server/smb_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/smb/server/smb_common.c b/fs/smb/server/smb_common.c
index a7e81067bc99..b51f431ade01 100644
--- a/fs/smb/server/smb_common.c
+++ b/fs/smb/server/smb_common.c
@@ -266,7 +266,7 @@ static int ksmbd_negotiate_smb_dialect(void *buf)
 		if (smb2_neg_size > smb_buf_length)
 			goto err_out;
 
-		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
+		if (struct_size(req, Dialects, le16_to_cpu(req->DialectCount)) >
 		    smb_buf_length)
 			goto err_out;
 
-- 
2.34.1