From: Cong Wang <xiyou.wangcong@gmail.com>
To: netdev@vger.kernel.org
Cc: Cong Wang <xiyou.wangcong@gmail.com>, Tom Herbert <tom@herbertland.com>
Subject: [Patch net-next] kcm: remove a useless copy_from_user()
Date: Thu, 13 Apr 2017 11:38:02 -0700 [thread overview]
Message-ID: <1492108682-30505-1-git-send-email-xiyou.wangcong@gmail.com> (raw)
struct kcm_clone only contains fd, and kcm_clone() only
writes this struct, so there is no need to copy it from user.
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
---
net/kcm/kcmsock.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 31762f7..deca20f 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1707,11 +1707,7 @@ static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
struct kcm_clone info;
struct socket *newsock = NULL;
- if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
- return -EFAULT;
-
err = kcm_clone(sock, &info, &newsock);
-
if (!err) {
if (copy_to_user((void __user *)arg, &info,
sizeof(info))) {
--
2.5.5
next reply other threads:[~2017-04-13 18:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-13 18:38 Cong Wang [this message]
2017-04-17 17:28 ` [Patch net-next] kcm: remove a useless copy_from_user() David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1492108682-30505-1-git-send-email-xiyou.wangcong@gmail.com \
--to=xiyou.wangcong@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=tom@herbertland.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).