From: Paolo Abeni <pabeni@redhat.com>
Date: Thu, 15 Feb 2018 16:59:49 +0100
Subject: dn_getsockoptdecnet: move nf_{get/set}sockopt outside sock lock
Patch-mainline: v4.16-rc3
Git-commit: dfec091439bb2acf763497cfc58f2bdfc67c56b7
References: bsc#1076830
After commit 3f34cfae1238 ("netfilter: on sockopt() acquire sock lock
only in the required scope"), the caller of nf_{get/set}sockopt() must
not hold any lock, but, in such changeset, I forgot to cope with DECnet.
This commit addresses the issue moving the nf call outside the lock,
in the dn_{get,set}sockopt() with the same schema currently used by
ipv4 and ipv6. Also moves the unhandled sockopts of the end of the main
switch statements, to improve code readability.
Reported-by: Petr Vandrovec <petr@vandrovec.name>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=198791#c2
Fixes: 3f34cfae1238 ("netfilter: on sockopt() acquire sock lock only in the required scope")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Kubecek <mkubecek@suse.cz>
---
net/decnet/af_decnet.c | 62 +++++++++++++++++++++++++++-----------------------
1 file changed, 33 insertions(+), 29 deletions(-)
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 405483a07efc..8094f055d430 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -1339,6 +1339,12 @@ static int dn_setsockopt(struct socket *sock, int level, int optname, char __use
lock_sock(sk);
err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
release_sock(sk);
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
+ optname != DSO_STREAM && optname != DSO_SEQPACKET)
+ err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
+#endif
return err;
}
@@ -1446,15 +1452,6 @@ static int __dn_setsockopt(struct socket *sock, int level,int optname, char __us
dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
break;
- default:
-#ifdef CONFIG_NETFILTER
- return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
-#endif
- case DSO_LINKINFO:
- case DSO_STREAM:
- case DSO_SEQPACKET:
- return -ENOPROTOOPT;
-
case DSO_MAXWINDOW:
if (optlen != sizeof(unsigned long))
return -EINVAL;
@@ -1502,6 +1499,12 @@ static int __dn_setsockopt(struct socket *sock, int level,int optname, char __us
return -EINVAL;
scp->info_loc = u.info;
break;
+
+ case DSO_LINKINFO:
+ case DSO_STREAM:
+ case DSO_SEQPACKET:
+ default:
+ return -ENOPROTOOPT;
}
return 0;
@@ -1515,6 +1518,20 @@ static int dn_getsockopt(struct socket *sock, int level, int optname, char __use
lock_sock(sk);
err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
release_sock(sk);
+#ifdef CONFIG_NETFILTER
+ if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
+ optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
+ optname != DSO_CONREJECT) {
+ int len;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
+ if (err >= 0)
+ err = put_user(len, optlen);
+ }
+#endif
return err;
}
@@ -1580,26 +1597,6 @@ static int __dn_getsockopt(struct socket *sock, int level,int optname, char __us
r_data = &link;
break;
- default:
-#ifdef CONFIG_NETFILTER
- {
- int ret, len;
-
- if (get_user(len, optlen))
- return -EFAULT;
-
- ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
- if (ret >= 0)
- ret = put_user(len, optlen);
- return ret;
- }
-#endif
- case DSO_STREAM:
- case DSO_SEQPACKET:
- case DSO_CONACCEPT:
- case DSO_CONREJECT:
- return -ENOPROTOOPT;
-
case DSO_MAXWINDOW:
if (r_len > sizeof(unsigned long))
r_len = sizeof(unsigned long);
@@ -1631,6 +1628,13 @@ static int __dn_getsockopt(struct socket *sock, int level,int optname, char __us
r_len = sizeof(unsigned char);
r_data = &scp->info_rem;
break;
+
+ case DSO_STREAM:
+ case DSO_SEQPACKET:
+ case DSO_CONACCEPT:
+ case DSO_CONREJECT:
+ default:
+ return -ENOPROTOOPT;
}
if (r_data) {
--
2.16.2