Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
net/sctp/socket.c | 50 ++++++++++++++++++-----------------------------
1 file changed, 19 insertions(+), 31 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index eb08e44c0c57a..f7621ea99340e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1282,36 +1282,29 @@ static int __sctp_connect(struct sock *sk, struct
sockaddr *kaddrs,
* it.
*
* sk The sk of the socket
- * addrs The pointer to the addresses in user land
+ * addrs The pointer to the addresses
* addrssize Size of the addrs buffer
*
* Returns >=0 if ok, <0 errno code on error.
*/
-static int __sctp_setsockopt_connectx(struct sock *sk,
- struct sockaddr __user *addrs,
- int addrs_size,
- sctp_assoc_t *assoc_id)
+static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
+ int addrs_size, sctp_assoc_t *assoc_id)
{
- struct sockaddr *kaddrs;
int err = 0, flags = 0;
pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
- __func__, sk, addrs, addrs_size);
+ __func__, sk, kaddrs, addrs_size);
/* make sure the 1st addr's sa_family is accessible later */
if (unlikely(addrs_size < sizeof(sa_family_t)))
return -EINVAL;
- kaddrs = memdup_user(addrs, addrs_size);
- if (IS_ERR(kaddrs))
- return PTR_ERR(kaddrs);
-
/* Allow security module to validate connectx addresses. */
err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
(struct sockaddr *)kaddrs,
addrs_size);
if (err)
- goto out_free;
+ return err;
/* in-kernel sockets don't generally have a file allocated to them
* if all they do is call sock_create_kern().
@@ -1319,12 +1312,7 @@ static int __sctp_setsockopt_connectx(struct sock *sk,
if (sk->sk_socket->file)
flags = sk->sk_socket->file->f_flags;
- err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
-
-out_free:
- kfree(kaddrs);
-
- return err;
+ return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
}
/*
@@ -1332,10 +1320,10 @@ static int __sctp_setsockopt_connectx(struct sock *sk,
* to the option that doesn't provide association id.
*/
static int sctp_setsockopt_connectx_old(struct sock *sk,
- struct sockaddr __user *addrs,
+ struct sockaddr *kaddrs,
int addrs_size)
{
- return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
+ return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
}
/*
@@ -1345,13 +1333,13 @@ static int sctp_setsockopt_connectx_old(struct sock *sk,
* always positive.
*/
static int sctp_setsockopt_connectx(struct sock *sk,
- struct sockaddr __user *addrs,
+ struct sockaddr *kaddrs,
int addrs_size)
{
sctp_assoc_t assoc_id = 0;
int err = 0;
- err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
+ err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
if (err)
return err;
@@ -1381,6 +1369,7 @@ static int sctp_getsockopt_connectx3(struct sock *sk, int
len,
{
struct sctp_getaddrs_old param;
sctp_assoc_t assoc_id = 0;
+ struct sockaddr *kaddrs;
int err = 0;
#ifdef CONFIG_COMPAT
@@ -1404,9 +1393,12 @@ static int sctp_getsockopt_connectx3(struct sock *sk,
int len,
return -EFAULT;
}
- err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
- param.addrs, param.addr_num,
- &assoc_id);
+ kaddrs = memdup_user(param.addrs, param.addr_num);
+ if (IS_ERR(kaddrs))
+ return PTR_ERR(kaddrs);
+
+ err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
+ kfree(kaddrs);
if (err == 0 || err == -EINPROGRESS) {
if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
return -EFAULT;
@@ -4696,16 +4688,12 @@ static int sctp_setsockopt(struct sock *sk, int level,
int optname,
case SCTP_SOCKOPT_CONNECTX_OLD:
/* 'optlen' is the size of the addresses buffer. */
- retval = sctp_setsockopt_connectx_old(sk,
- (struct sockaddr __user *)optval,
- optlen);
+ retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
break;
case SCTP_SOCKOPT_CONNECTX:
/* 'optlen' is the size of the addresses buffer. */
- retval = sctp_setsockopt_connectx(sk,
- (struct sockaddr __user *)optval,
- optlen);
+ retval = sctp_setsockopt_connectx(sk, kopt, optlen);
break;
case SCTP_DISABLE_FRAGMENTS:
--
2.26.2
