netdev - [PATCH net-next 06/11] udp/ipv6: optimise out daddr reassignment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 28 Apr 2022 11:56:37 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH net-next 06/11] udp/ipv6: optimise out daddr reassignment

There is nothing that checks daddr placement in udpv6_sendmsg(), so the
check reassigning it to ->sk_v6_daddr looks like a not needed anymore
artifact from the past. Remove it.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/ipv6/udp.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1f05e165eb17..34c5919afa3e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1417,14 +1417,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 			}
 		}
 
-		/*
-		 * Otherwise it will be difficult to maintain
-		 * sk->sk_dst_cache.
-		 */
-		if (sk->sk_state == TCP_ESTABLISHED &&
-		    ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
-			daddr = &sk->sk_v6_daddr;
-
 		if (addr_len >= sizeof(struct sockaddr_in6) &&
 		    sin6->sin6_scope_id &&
 		    __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
-- 
2.36.0