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Date:   Thu, 21 May 2020 19:47:17 +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 42/49] sctp: pass a kernel pointer to sctp_setsockopt_scheduler_value

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 | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 122e6b95a8f0d..4d61c2885f8f2 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4154,38 +4154,32 @@ static int sctp_setsockopt_scheduler(struct sock *sk,
 }
 
 static int sctp_setsockopt_scheduler_value(struct sock *sk,
-					   char __user *optval,
+					   struct sctp_stream_value *params,
 					   unsigned int optlen)
 {
-	struct sctp_stream_value params;
 	struct sctp_association *asoc;
 	int retval = -EINVAL;
 
-	if (optlen < sizeof(params))
-		goto out;
-
-	optlen = sizeof(params);
-	if (copy_from_user(&params, optval, optlen)) {
-		retval = -EFAULT;
+	if (optlen < sizeof(*params))
 		goto out;
-	}
 
-	asoc = sctp_id2assoc(sk, params.assoc_id);
-	if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
+	asoc = sctp_id2assoc(sk, params->assoc_id);
+	if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
 	    sctp_style(sk, UDP))
 		goto out;
 
 	if (asoc) {
-		retval = sctp_sched_set_value(asoc, params.stream_id,
-					      params.stream_value, GFP_KERNEL);
+		retval = sctp_sched_set_value(asoc, params->stream_id,
+					      params->stream_value, GFP_KERNEL);
 		goto out;
 	}
 
 	retval = 0;
 
 	list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
-		int ret = sctp_sched_set_value(asoc, params.stream_id,
-					       params.stream_value, GFP_KERNEL);
+		int ret = sctp_sched_set_value(asoc, params->stream_id,
+					       params->stream_value,
+					       GFP_KERNEL);
 		if (ret && !retval) /* try to return the 1st error. */
 			retval = ret;
 	}
@@ -4654,7 +4648,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 		retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
 		break;
 	case SCTP_STREAM_SCHEDULER_VALUE:
-		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
+		retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
 		break;
 	case SCTP_INTERLEAVING_SUPPORTED:
 		retval = sctp_setsockopt_interleaving_supported(sk, optval,
-- 
2.26.2

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