* [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled
@ 2019-08-14 5:31 John Fastabend
2019-08-14 17:08 ` Jakub Kicinski
2019-08-15 19:41 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: John Fastabend @ 2019-08-14 5:31 UTC (permalink / raw)
To: jakub.kicinski, davem; +Cc: ying.xue, netdev, john.fastabend, andreyknvl
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>
---
net/tls/tls_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index ce6ef56a65ef..43252a801c3f 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -308,7 +308,8 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
if (free_ctx)
icsk->icsk_ulp_data = NULL;
sk->sk_prot = ctx->sk_proto;
- sk->sk_write_space = ctx->sk_write_space;
+ if (sk->sk_write_space == tls_write_space)
+ sk->sk_write_space = ctx->sk_write_space;
write_unlock_bh(&sk->sk_callback_lock);
release_sock(sk);
if (ctx->tx_conf == TLS_SW)
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled
2019-08-14 5:31 [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled John Fastabend
@ 2019-08-14 17:08 ` Jakub Kicinski
2019-08-15 19:41 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Jakub Kicinski @ 2019-08-14 17:08 UTC (permalink / raw)
To: John Fastabend; +Cc: davem, ying.xue, netdev, andreyknvl
On Wed, 14 Aug 2019 05:31:54 +0000, John Fastabend wrote:
> 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>
Thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled
2019-08-14 5:31 [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled John Fastabend
2019-08-14 17:08 ` Jakub Kicinski
@ 2019-08-15 19:41 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2019-08-15 19:41 UTC (permalink / raw)
To: john.fastabend; +Cc: jakub.kicinski, ying.xue, netdev, andreyknvl
From: John Fastabend <john.fastabend@gmail.com>
Date: Wed, 14 Aug 2019 05:31:54 +0000
> 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>
Applied, thanks John.
That Fixes tag takes one through an interesting chain of fixes to fixes.
I'll queue this up for -stable and make sure it all ends up in the
proper place.
Thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-08-15 19:41 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-14 5:31 [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled John Fastabend
2019-08-14 17:08 ` Jakub Kicinski
2019-08-15 19:41 ` David Miller
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).