diff mbox series

[v1,net-next,5/6] net: Do not ignore the error by sk->sk_prot->get_port().

Message ID 20221104190612.24206-6-kuniyu@amazon.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series udp: Introduce optional per-netns hash table. | expand

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Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 12 this patch: 12
netdev/cc_maintainers warning 2 maintainers not CCed: yoshfuji@linux-ipv6.org dsahern@kernel.org
netdev/build_clang success Errors and warnings before: 5 this patch: 5
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 12 this patch: 12
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 68 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Kuniyuki Iwashima Nov. 4, 2022, 7:06 p.m. UTC 
We assume sk->sk_prot->get_port() returns -EADDRINUSE on error, so
some ->get_port() functions return just 1 on failure and the its
caller returns -EADDRINUSE.

However, mptcp_get_port() can return -EINVAL.  Also, the following
patch adds another error in udp_lib_get_port().  Let's not ignore
the error.

Note the only exception is inet_autobind(), all of whose callers
return -EAGAIN instead.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 net/ipv4/af_inet.c              | 4 ++--
 net/ipv4/inet_connection_sock.c | 7 ++++---
 net/ipv4/ping.c                 | 2 +-
 net/ipv4/udp.c                  | 2 +-
 net/ipv6/af_inet6.c             | 4 ++--
 5 files changed, 10 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 378bcd777514..5b4d86701822 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -522,9 +522,9 @@  int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 	/* Make sure we are allowed to bind here. */
 	if (snum || !(inet->bind_address_no_port ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
-		if (sk->sk_prot->get_port(sk, snum)) {
+		err = sk->sk_prot->get_port(sk, snum);
+		if (err) {
 			inet->inet_saddr = inet->inet_rcv_saddr = 0;
-			err = -EADDRINUSE;
 			goto out_release_sock;
 		}
 		if (!(flags & BIND_FROM_BPF)) {
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 4e84ed21d16f..4a34bc7cb15e 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -471,11 +471,11 @@  int inet_csk_get_port(struct sock *sk, unsigned short snum)
 	bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
 	bool found_port = false, check_bind_conflict = true;
 	bool bhash_created = false, bhash2_created = false;
+	int ret = -EADDRINUSE, port = snum, l3mdev;
 	struct inet_bind_hashbucket *head, *head2;
 	struct inet_bind2_bucket *tb2 = NULL;
 	struct inet_bind_bucket *tb = NULL;
 	bool head2_lock_acquired = false;
-	int ret = 1, port = snum, l3mdev;
 	struct net *net = sock_net(sk);
 
 	l3mdev = inet_sk_bound_l3mdev(sk);
@@ -1186,7 +1186,7 @@  int inet_csk_listen_start(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct inet_sock *inet = inet_sk(sk);
-	int err = -EADDRINUSE;
+	int err;
 
 	reqsk_queue_alloc(&icsk->icsk_accept_queue);
 
@@ -1202,7 +1202,8 @@  int inet_csk_listen_start(struct sock *sk)
 	 * after validation is complete.
 	 */
 	inet_sk_state_store(sk, TCP_LISTEN);
-	if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
+	err = sk->sk_prot->get_port(sk, inet->inet_num);
+	if (!err) {
 		inet->inet_sport = htons(inet->inet_num);
 
 		sk_dst_reset(sk);
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index bde333b24837..bb9854c2b7a1 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -138,7 +138,7 @@  int ping_get_port(struct sock *sk, unsigned short ident)
 
 fail:
 	spin_unlock(&ping_table.lock);
-	return 1;
+	return -EADDRINUSE;
 }
 EXPORT_SYMBOL_GPL(ping_get_port);
 
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index efe0b3706bd9..245d06627b2d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -246,7 +246,7 @@  int udp_lib_get_port(struct sock *sk, unsigned short snum,
 	struct udp_table *udptable = udp_get_table_prot(sk);
 	struct udp_hslot *hslot, *hslot2;
 	struct net *net = sock_net(sk);
-	int error = 1;
+	int error = -EADDRINUSE;
 
 	if (!snum) {
 		DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 68075295d587..fee9163382c2 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -410,10 +410,10 @@  static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 	/* Make sure we are allowed to bind here. */
 	if (snum || !(inet->bind_address_no_port ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
-		if (sk->sk_prot->get_port(sk, snum)) {
+		err = sk->sk_prot->get_port(sk, snum);
+		if (err) {
 			sk->sk_ipv6only = saved_ipv6only;
 			inet_reset_saddr(sk);
-			err = -EADDRINUSE;
 			goto out;
 		}
 		if (!(flags & BIND_FROM_BPF)) {