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Date:   Thu, 21 May 2020 19:46:39 +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 04/49] sctp: pass a kernel pointer to sctp_setsockopt_disable_fragments

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 | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index f7621ea99340e..0ca8001acfd50 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2180,20 +2180,12 @@ static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
  * exceeds the current PMTU size, the message will NOT be sent and
  * instead a error will be indicated to the user.
  */
-static int sctp_setsockopt_disable_fragments(struct sock *sk,
-					     char __user *optval,
+static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
 					     unsigned int optlen)
 {
-	int val;
-
 	if (optlen < sizeof(int))
 		return -EINVAL;
-
-	if (get_user(val, (int __user *)optval))
-		return -EFAULT;
-
-	sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
-
+	sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
 	return 0;
 }
 
@@ -4697,7 +4689,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 		break;
 
 	case SCTP_DISABLE_FRAGMENTS:
-		retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
+		retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
 		break;
 
 	case SCTP_EVENTS:
-- 
2.26.2

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