linux-kernel - [PATCH 4.19 32/93] net/tls: swap sk_write

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Message-Id: <20190904175306.030325372@linuxfoundation.org>
Date:   Wed,  4 Sep 2019 19:53:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+dcdc9deefaec44785f32@...kaller.appspotmail.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 32/93] net/tls: swap sk_write_space on close

From: Jakub Kicinski <jakub.kicinski@...ronome.com>

[ 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@...kaller.appspotmail.com
Fixes: 95fa145479fb ("bpf: sockmap/tls, close can race with map free")
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/tls/tls_main.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -301,6 +301,7 @@ static void tls_sk_proto_close(struct so
 #else
 	{
 #endif
+		sk->sk_write_space = ctx->sk_write_space;
 		tls_ctx_free(ctx);
 		ctx = NULL;
 	}