netdev - [PATCH net 2/7] wireguard: socket: remove bogus _

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Message-Id: <20210222162549.3252778-3-Jason@zx2c4.com>
Date:   Mon, 22 Feb 2021 17:25:44 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Subject: [PATCH net 2/7] wireguard: socket: remove bogus __be32 annotation

From: Jann Horn <jannh@...gle.com>

The endpoint->src_if4 has nothing to do with fixed-endian numbers; remove
the bogus annotation.

This was introduced in
https://git.zx2c4.com/wireguard-monolithic-historical/commit?id=14e7d0a499a676ec55176c0de2f9fcbd34074a82
in the historical WireGuard repo because the old code used to
zero-initialize multiple members as follows:

    endpoint->src4.s_addr = endpoint->src_if4 = fl.saddr = 0;

Because fl.saddr is fixed-endian and an assignment returns a value with the
type of its left operand, this meant that sparse detected an assignment
between values of different endianness.

Since then, this assignment was already split up into separate statements;
just the cast survived.

Signed-off-by: Jann Horn <jannh@...gle.com>
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 drivers/net/wireguard/socket.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/socket.c b/drivers/net/wireguard/socket.c
index 41430c0e465a..d9ad850daa79 100644
--- a/drivers/net/wireguard/socket.c
+++ b/drivers/net/wireguard/socket.c
@@ -53,7 +53,7 @@ static int send4(struct wg_device *wg, struct sk_buff *skb,
 		if (unlikely(!inet_confirm_addr(sock_net(sock), NULL, 0,
 						fl.saddr, RT_SCOPE_HOST))) {
 			endpoint->src4.s_addr = 0;
-			*(__force __be32 *)&endpoint->src_if4 = 0;
+			endpoint->src_if4 = 0;
 			fl.saddr = 0;
 			if (cache)
 				dst_cache_reset(cache);
@@ -63,7 +63,7 @@ static int send4(struct wg_device *wg, struct sk_buff *skb,
 			     PTR_ERR(rt) == -EINVAL) || (!IS_ERR(rt) &&
 			     rt->dst.dev->ifindex != endpoint->src_if4)))) {
 			endpoint->src4.s_addr = 0;
-			*(__force __be32 *)&endpoint->src_if4 = 0;
+			endpoint->src_if4 = 0;
 			fl.saddr = 0;
 			if (cache)
 				dst_cache_reset(cache);
-- 
2.30.1