netdev - [PATCH net-next] scm: fix a typo in put

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Message-Id: <20210416183538.1194197-1-eric.dumazet@gmail.com>
Date:   Fri, 16 Apr 2021 11:35:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next] scm: fix a typo in put_cmsg()

From: Eric Dumazet <edumazet@...gle.com>

We need to store cmlen instead of len in cm->cmsg_len.

Fixes: 38ebcf5096a8 ("scm: optimize put_cmsg()")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Jakub Kicinski <kuba@...nel.org>
---
 net/core/scm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/scm.c b/net/core/scm.c
index bd96c922041d22a2f3b7ee73e4b3183316f9b616..ae3085d9aae8adb81d3bb42c8a915a205476a0ee 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -232,7 +232,7 @@ int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
 		if (!user_write_access_begin(cm, cmlen))
 			goto efault;
 
-		unsafe_put_user(len, &cm->cmsg_len, efault_end);
+		unsafe_put_user(cmlen, &cm->cmsg_len, efault_end);
 		unsafe_put_user(level, &cm->cmsg_level, efault_end);
 		unsafe_put_user(type, &cm->cmsg_type, efault_end);
 		unsafe_copy_to_user(CMSG_USER_DATA(cm), data,
-- 
2.31.1.368.gbe11c130af-goog