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Date: Sun, 19 Nov 2017 21:47:38 +0800
From: yuan linyu <cugyly@....com>
To: netdev@...r.kernel.org
Cc: "David S . Miller" <davem@...emloft.net>,
yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
Subject: [PATCH net-next] netlink: optimize err assignment
From: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
Signed-off-by: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
---
net/netlink/af_netlink.c | 54 +++++++++++++++++++++---------------------------
1 file changed, 23 insertions(+), 31 deletions(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index b9e0ee4..37ce0d3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -533,14 +533,16 @@ static int netlink_insert(struct sock *sk, u32 portid)
lock_sock(sk);
- err = nlk_sk(sk)->portid == portid ? 0 : -EBUSY;
- if (nlk_sk(sk)->bound)
+ if (nlk_sk(sk)->bound) {
+ err = nlk_sk(sk)->portid == portid ? 0 : -EBUSY;
goto err;
+ }
- err = -ENOMEM;
if (BITS_PER_LONG > 32 &&
- unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
+ unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX)) {
+ err = -ENOMEM;
goto err;
+ }
nlk_sk(sk)->portid = portid;
sock_hold(sk);
@@ -1585,8 +1587,8 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
{
struct sock *sk = sock->sk;
struct netlink_sock *nlk = nlk_sk(sk);
- unsigned int val = 0;
- int err;
+ unsigned int val;
+ int err = 0;
if (level != SOL_NETLINK)
return -ENOPROTOOPT;
@@ -1601,7 +1603,6 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
nlk->flags |= NETLINK_F_RECV_PKTINFO;
else
nlk->flags &= ~NETLINK_F_RECV_PKTINFO;
- err = 0;
break;
case NETLINK_ADD_MEMBERSHIP:
case NETLINK_DROP_MEMBERSHIP: {
@@ -1623,8 +1624,6 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
netlink_table_ungrab();
if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind)
nlk->netlink_unbind(sock_net(sk), val);
-
- err = 0;
break;
}
case NETLINK_BROADCAST_ERROR:
@@ -1632,7 +1631,6 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
nlk->flags |= NETLINK_F_BROADCAST_SEND_ERROR;
else
nlk->flags &= ~NETLINK_F_BROADCAST_SEND_ERROR;
- err = 0;
break;
case NETLINK_NO_ENOBUFS:
if (val) {
@@ -1642,7 +1640,6 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
} else {
nlk->flags &= ~NETLINK_F_RECV_NO_ENOBUFS;
}
- err = 0;
break;
case NETLINK_LISTEN_ALL_NSID:
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_BROADCAST))
@@ -1652,21 +1649,18 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
nlk->flags |= NETLINK_F_LISTEN_ALL_NSID;
else
nlk->flags &= ~NETLINK_F_LISTEN_ALL_NSID;
- err = 0;
break;
case NETLINK_CAP_ACK:
if (val)
nlk->flags |= NETLINK_F_CAP_ACK;
else
nlk->flags &= ~NETLINK_F_CAP_ACK;
- err = 0;
break;
case NETLINK_EXT_ACK:
if (val)
nlk->flags |= NETLINK_F_EXT_ACK;
else
nlk->flags &= ~NETLINK_F_EXT_ACK;
- err = 0;
break;
default:
err = -ENOPROTOOPT;
@@ -1679,7 +1673,7 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
{
struct sock *sk = sock->sk;
struct netlink_sock *nlk = nlk_sk(sk);
- int len, val, err;
+ int len, val, err = 0;
if (level != SOL_NETLINK)
return -ENOPROTOOPT;
@@ -1698,7 +1692,6 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
if (put_user(len, optlen) ||
put_user(val, optval))
return -EFAULT;
- err = 0;
break;
case NETLINK_BROADCAST_ERROR:
if (len < sizeof(int))
@@ -1708,7 +1701,6 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
if (put_user(len, optlen) ||
put_user(val, optval))
return -EFAULT;
- err = 0;
break;
case NETLINK_NO_ENOBUFS:
if (len < sizeof(int))
@@ -1718,12 +1710,10 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
if (put_user(len, optlen) ||
put_user(val, optval))
return -EFAULT;
- err = 0;
break;
case NETLINK_LIST_MEMBERSHIPS: {
int pos, idx, shift;
- err = 0;
netlink_lock_table();
for (pos = 0; pos * 8 < nlk->ngroups; pos += sizeof(u32)) {
if (len - pos < sizeof(u32))
@@ -1750,7 +1740,6 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
if (put_user(len, optlen) ||
put_user(val, optval))
return -EFAULT;
- err = 0;
break;
case NETLINK_EXT_ACK:
if (len < sizeof(int))
@@ -1759,7 +1748,6 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
val = nlk->flags & NETLINK_F_EXT_ACK ? 1 : 0;
if (put_user(len, optlen) || put_user(val, optval))
return -EFAULT;
- err = 0;
break;
default:
err = -ENOPROTOOPT;
@@ -1805,15 +1793,17 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
return err;
if (msg->msg_namelen) {
- err = -EINVAL;
- if (addr->nl_family != AF_NETLINK)
+ if (addr->nl_family != AF_NETLINK) {
+ err = -EINVAL;
goto out;
+ }
dst_portid = addr->nl_pid;
dst_group = ffs(addr->nl_groups);
- err = -EPERM;
if ((dst_group || dst_portid) &&
- !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
+ !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) {
+ err = -EPERM;
goto out;
+ }
netlink_skb_flags |= NETLINK_SKB_DST;
} else {
dst_portid = nlk->dst_portid;
@@ -1829,22 +1819,24 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
smp_rmb();
}
- err = -EMSGSIZE;
- if (len > sk->sk_sndbuf - 32)
+ if (len > sk->sk_sndbuf - 32) {
+ err = -EMSGSIZE;
goto out;
- err = -ENOBUFS;
+ }
skb = netlink_alloc_large_skb(len, dst_group);
- if (skb == NULL)
+ if (skb == NULL) {
+ err = -ENOBUFS;
goto out;
+ }
NETLINK_CB(skb).portid = nlk->portid;
NETLINK_CB(skb).dst_group = dst_group;
NETLINK_CB(skb).creds = scm.creds;
NETLINK_CB(skb).flags = netlink_skb_flags;
- err = -EFAULT;
if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
kfree_skb(skb);
+ err = -EFAULT;
goto out;
}
@@ -2711,7 +2703,7 @@ static int __init netlink_proto_init(void)
int i;
int err = proto_register(&netlink_proto, 0);
- if (err != 0)
+ if (err)
goto out;
BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb));
--
2.7.4
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