net/tls: swap sk_write_space on close

[ Upstream commit 57c722e932cfb82e9820bbaae1b1f7222ea97b52 ]

Now that we swap the original proto and clear the ULP pointer
on close we have to make sure no callback will try to access
the freed state. sk_write_space is not part of sk_prot, remember
to swap it.

Reported-by: syzbot+dcdc9deefaec44785f32@syzkaller.appspotmail.com
Fixes: 95fa145479fb ("bpf: sockmap/tls, close can race with map free")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 4c0ac79f82d4e59dc2d5148bcc9fadee7b37622e..f636aff11d51e53d03c5e9f34e3903dc0127a4f0 100644 (file)
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -301,6 +301,7 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
 #else
        {
 #endif
+               sk->sk_write_space = ctx->sk_write_space;
                tls_ctx_free(ctx);
                ctx = NULL;
        }