linux-kernel - [PATCH net-next 3/3] sctp: Replace sockaddr with sockaddr_inet in sctp

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Message-Id: <20250722171836.1078436-3-kees@kernel.org>
Date: Tue, 22 Jul 2025 10:18:33 -0700
From: Kees Cook <kees@...nel.org>
To: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc: Kees Cook <kees@...nel.org>,
	Xin Long <lucien.xin@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	linux-kernel@...r.kernel.org,
	wireguard@...ts.zx2c4.com,
	linux-hardening@...r.kernel.org
Subject: [PATCH net-next 3/3] sctp: Replace sockaddr with sockaddr_inet in sctp_addr union

As part of the removal of the variably-sized sockaddr for kernel
internals, replace struct sockaddr with sockaddr_inet in the sctp_addr
union.

No binary changes; the union size remains unchanged due to sockaddr_inet
matching the size of sockaddr_in6.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc: Xin Long <lucien.xin@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>
Cc: <linux-sctp@...r.kernel.org>
Cc: <netdev@...r.kernel.org>
---
 include/net/sctp/structs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 1ad7ce71d0a7..8a540ad9b509 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -51,9 +51,9 @@
  * We should wean ourselves off this.
  */
 union sctp_addr {
+	struct sockaddr_inet sa;	/* Large enough for both address families */
 	struct sockaddr_in v4;
 	struct sockaddr_in6 v6;
-	struct sockaddr sa;
 };
 
 /* Forward declarations for data structures. */
-- 
2.34.1