[PATCH 6.1.y 30/73] ksmbd: Use struct_size() helper in ksmbd_negotiate_smb_dialect()

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From: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>

[ Upstream commit 5211cc8727ed9701b04976ab47602955e5641bda ]

Prefer struct_size() over open-coded versions.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
---
 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 62c33d3357fe..b6f414a2404b 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;
 
-- 
2.25.1





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