tree ba4af3fb333f9ee72af950c4772b58490cea6753
parent fdc4400e962804bc9d9364fcaa998c0b084eff72
author John Fastabend <john.fastabend@gmail.com> 1565760714 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1567758124 +0200

net: tls, fix sk_write_space NULL write when tx disabled

[ Upstream commit d85f01775850a35eae47a0090839baf510c1ef12 ]

The ctx->sk_write_space pointer is only set when TLS tx mode is enabled.
When running without TX mode its a null pointer but we still set the
sk sk_write_space pointer on close().

Fix the close path to only overwrite sk->sk_write_space when the current
pointer is to the tls_write_space function indicating the tls module should
clean it up properly as well.

Reported-by: Hillf Danton <hdanton@sina.com>
Cc: Ying Xue <ying.xue@windriver.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Fixes: 57c722e932cfb ("net/tls: swap sk_write_space on close")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Reviewed-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>