From: Eric Dumazet <edumazet@google.com>
Date: Fri, 16 Apr 2021 18:35:38 +0000 (-0700)
Subject: scm: fix a typo in put_cmsg()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e7ad33fa7bc5f788cdb14eea68c65c4da0f06edf;p=linux.git

scm: fix a typo in put_cmsg()

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

Fixes: 38ebcf5096a8 ("scm: optimize put_cmsg()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/scm.c b/net/core/scm.c
index bd96c922041d2..ae3085d9aae8a 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,