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Message-Id: <20200513062649.2100053-27-hch@lst.de>
Date: Wed, 13 May 2020 08:26:41 +0200
From: Christoph Hellwig <hch@....de>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Eric Dumazet <edumazet@...gle.com>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Vlad Yasevich <vyasevich@...il.com>,
Neil Horman <nhorman@...driver.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Jon Maloy <jmaloy@...hat.com>,
Ying Xue <ying.xue@...driver.com>, drbd-dev@...ts.linbit.com,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rdma@...r.kernel.org, linux-nvme@...ts.infradead.org,
target-devel@...r.kernel.org, linux-afs@...ts.infradead.org,
linux-cifs@...r.kernel.org, cluster-devel@...hat.com,
ocfs2-devel@....oracle.com, netdev@...r.kernel.org,
linux-sctp@...r.kernel.org, ceph-devel@...r.kernel.org,
rds-devel@....oracle.com, linux-nfs@...r.kernel.org
Subject: [PATCH 26/33] sctp: lift copying in addrs into sctp_setsockopt
Prepare for additional kernel-space callers of sctp_setsockopt_bindx.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/sctp/socket.c | 71 ++++++++++++++++++-----------------------------
1 file changed, 27 insertions(+), 44 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 827a9903ee288..1c96b52c4aa28 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -972,18 +972,16 @@ int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
* 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
* op Operation to perform (add or remove, see the flags of
* sctp_bindx)
*
* Returns 0 if ok, <0 errno code on error.
*/
-static int sctp_setsockopt_bindx(struct sock *sk,
- struct sockaddr __user *addrs,
+static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *kaddrs,
int addrs_size, int op)
{
- struct sockaddr *kaddrs;
int err;
int addrcnt = 0;
int walk_size = 0;
@@ -991,23 +989,13 @@ static int sctp_setsockopt_bindx(struct sock *sk,
void *addr_buf;
struct sctp_af *af;
- pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
- __func__, sk, addrs, addrs_size, op);
-
- if (unlikely(addrs_size <= 0))
- return -EINVAL;
+ pr_debug("%s: sk:%p kaddrs:%p addrs_size:%d opt:%d\n",
+ __func__, sk, kaddrs, addrs_size, op);
- kaddrs = memdup_user(addrs, addrs_size);
- if (IS_ERR(kaddrs))
- return PTR_ERR(kaddrs);
-
- /* Walk through the addrs buffer and count the number of addresses. */
addr_buf = kaddrs;
while (walk_size < addrs_size) {
- if (walk_size + sizeof(sa_family_t) > addrs_size) {
- kfree(kaddrs);
+ if (walk_size + sizeof(sa_family_t) > addrs_size)
return -EINVAL;
- }
sa_addr = addr_buf;
af = sctp_get_af_specific(sa_addr->sa_family);
@@ -1015,10 +1003,8 @@ static int sctp_setsockopt_bindx(struct sock *sk,
/* If the address family is not supported or if this address
* causes the address buffer to overflow return EINVAL.
*/
- if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
- kfree(kaddrs);
+ if (!af || (walk_size + af->sockaddr_len) > addrs_size)
return -EINVAL;
- }
addrcnt++;
addr_buf += af->sockaddr_len;
walk_size += af->sockaddr_len;
@@ -1032,29 +1018,19 @@ static int sctp_setsockopt_bindx(struct sock *sk,
(struct sockaddr *)kaddrs,
addrs_size);
if (err)
- goto out;
+ return err;
err = sctp_bindx_add(sk, kaddrs, addrcnt);
if (err)
- goto out;
- err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
- break;
-
+ return err;
+ return sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
case SCTP_BINDX_REM_ADDR:
err = sctp_bindx_rem(sk, kaddrs, addrcnt);
if (err)
- goto out;
- err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
- break;
-
+ return err;
+ return sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
default:
- err = -EINVAL;
- break;
+ return -EINVAL;
}
-
-out:
- kfree(kaddrs);
-
- return err;
}
static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
@@ -4670,6 +4646,7 @@ static int sctp_setsockopt_pf_expose(struct sock *sk,
static int sctp_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen)
{
+ struct sockaddr *kaddrs;
int retval = 0;
pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
@@ -4682,30 +4659,37 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
*/
if (level != SOL_SCTP) {
struct sctp_af *af = sctp_sk(sk)->pf->af;
- retval = af->setsockopt(sk, level, optname, optval, optlen);
- goto out_nounlock;
+ return af->setsockopt(sk, level, optname, optval, optlen);
}
+ if (unlikely(optlen <= 0))
+ return -EINVAL;
+
+ kaddrs = memdup_user(optval, optlen);
+ if (IS_ERR(kaddrs))
+ return PTR_ERR(kaddrs);
+
+ /* Walk through the addrs buffer and count the number of addresses. */
+
lock_sock(sk);
switch (optname) {
case SCTP_SOCKOPT_BINDX_ADD:
/* 'optlen' is the size of the addresses buffer. */
- retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
+ retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval,
optlen, SCTP_BINDX_ADD_ADDR);
break;
case SCTP_SOCKOPT_BINDX_REM:
/* 'optlen' is the size of the addresses buffer. */
- retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
+ retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval,
optlen, SCTP_BINDX_REM_ADDR);
break;
case SCTP_SOCKOPT_CONNECTX_OLD:
/* 'optlen' is the size of the addresses buffer. */
retval = sctp_setsockopt_connectx_old(sk,
- (struct sockaddr __user *)optval,
- optlen);
+ (struct sockaddr *)optval, optlen);
break;
case SCTP_SOCKOPT_CONNECTX:
@@ -4871,8 +4855,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
}
release_sock(sk);
-
-out_nounlock:
+ kfree(kaddrs);
return retval;
}
--
2.26.2
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