From 9a8939490d401fefddf53cd5e4cb3e20a52b98a7 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 14 Apr 2020 23:13:50 +0100 Subject: net: tls: Avoid assigning 'const' pointer to non-const pointer MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit tls_build_proto() uses WRITE_ONCE() to assign a 'const' pointer to a 'non-const' pointer. Cleanups to the implementation of WRITE_ONCE() mean that this will give rise to a compiler warning, just like a plain old assignment would do: | net/tls/tls_main.c: In function ‘tls_build_proto’: | ./include/linux/compiler.h:229:30: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers] | net/tls/tls_main.c:640:4: note: in expansion of macro ‘smp_store_release’ | 640 | smp_store_release(&saved_tcpv6_prot, prot); | | ^~~~~~~~~~~~~~~~~ Drop the const qualifier from the local 'prot' variable, as it isn't needed. Cc: Boris Pismenny Cc: Aviad Yehezkel Cc: John Fastabend Cc: Daniel Borkmann Signed-off-by: Will Deacon --- net/tls/tls_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/tls') diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 156efce50dbd..b33e11c27cfa 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -629,7 +629,7 @@ struct tls_context *tls_ctx_create(struct sock *sk) static void tls_build_proto(struct sock *sk) { int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; - const struct proto *prot = READ_ONCE(sk->sk_prot); + struct proto *prot = READ_ONCE(sk->sk_prot); /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ if (ip_ver == TLSV6 && -- cgit v1.2.3-59-g8ed1b