netdev - [PATCH 45/51] sctp: pass a kernel pointer to sctp_setsockopt_reuse

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Date:   Sun, 19 Jul 2020 09:22:22 +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 45/51] sctp: pass a kernel pointer to sctp_setsockopt_reuse_port

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 | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 6232e46c4cdebd..a5b95e68cc129f 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4214,11 +4214,9 @@ static int sctp_setsockopt_interleaving_supported(struct sock *sk,
 	return 0;
 }
 
-static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
+static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
 				      unsigned int optlen)
 {
-	int val;
-
 	if (!sctp_style(sk, TCP))
 		return -EOPNOTSUPP;
 
@@ -4228,10 +4226,7 @@ static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
-		return -EFAULT;
-
-	sctp_sk(sk)->reuse = !!val;
+	sctp_sk(sk)->reuse = !!*val;
 
 	return 0;
 }
@@ -4645,7 +4640,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 								optlen);
 		break;
 	case SCTP_REUSE_PORT:
-		retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
+		retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
 		break;
 	case SCTP_EVENT:
 		retval = sctp_setsockopt_event(sk, optval, optlen);
-- 
2.27.0