netdev - [PATCH 06/49] sctp: pass a kernel pointer to sctp_setsockopt

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Date:   Thu, 21 May 2020 19:46:41 +0200
From:   Christoph Hellwig <hch@....de>
To:     Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        David Laight <David.Laight@...LAB.COM>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 06/49] sctp: pass a kernel pointer to sctp_setsockopt_autoclose

Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 net/sctp/socket.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 34bd2ce2ddf66..2fb3a5590a12e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2238,7 +2238,7 @@ static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
  * integer defining the number of seconds of idle time before an
  * association is closed.
  */
-static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
+static int sctp_setsockopt_autoclose(struct sock *sk, u32 *autoclose,
 				     unsigned int optlen)
 {
 	struct sctp_sock *sp = sctp_sk(sk);
@@ -2249,11 +2249,11 @@ static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
 		return -EOPNOTSUPP;
 	if (optlen != sizeof(int))
 		return -EINVAL;
-	if (copy_from_user(&sp->autoclose, optval, optlen))
-		return -EFAULT;
-
-	if (sp->autoclose > net->sctp.max_autoclose)
+	
+	if (*autoclose > net->sctp.max_autoclose)
 		sp->autoclose = net->sctp.max_autoclose;
+	else
+		sp->autoclose = *autoclose;
 
 	return 0;
 }
@@ -4692,7 +4692,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 		break;
 
 	case SCTP_AUTOCLOSE:
-		retval = sctp_setsockopt_autoclose(sk, optval, optlen);
+		retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
 		break;
 
 	case SCTP_PEER_ADDR_PARAMS:
-- 
2.26.2