From: Kuniyuki Iwashima <kuniyu@google.com>
Date: Tue, 3 Feb 2026 21:30:07 +0000 (+0000)
Subject: bpf: Don't check sk_fullsock() in bpf_skc_to_unix_sock().
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c26b098bf42c71111ca976ce330ea5c66b9a5d8e;p=thirdparty%2Fkernel%2Flinux.git

bpf: Don't check sk_fullsock() in bpf_skc_to_unix_sock().

AF_UNIX does not use TCP_NEW_SYN_RECV nor TCP_TIME_WAIT and
checking sk->sk_family is sufficient.

Let's remove sk_fullsock() and use sk_is_unix() in
bpf_skc_to_unix_sock().

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20260203213442.682838-3-kuniyu@google.com
---

diff --git a/net/core/filter.c b/net/core/filter.c
index f04982d79d72e..90bfe5a6c1db0 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -12021,7 +12021,7 @@ BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk)
 	 * trigger an explicit type generation here.
 	 */
 	BTF_TYPE_EMIT(struct unix_sock);
-	if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX)
+	if (sk && sk_is_unix(sk))
 		return (unsigned long)sk;
 
 	return (unsigned long)NULL;