linux-kernel - [PATCH 5.4 063/104] net/tls: fix async operation

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Message-Id: <20200128135826.241608399@linuxfoundation.org>
Date:   Tue, 28 Jan 2020 15:00:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mallesham Jatharakonda 
        <mallesham.jatharakonda@...convergence.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 063/104] net/tls: fix async operation

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

commit db885e66d268884dc72967279b7e84f522556abc upstream.

Mallesham reports the TLS with async accelerator was broken by
commit d10523d0b3d7 ("net/tls: free the record on encryption error")
because encryption can return -EINPROGRESS in such setups, which
should not be treated as an error.

The error is also present in the BPF path (likely copied from there).

Reported-by: Mallesham Jatharakonda <mallesham.jatharakonda@...convergence.com>
Fixes: d3b18ad31f93 ("tls: add bpf support to sk_msg handling")
Fixes: d10523d0b3d7 ("net/tls: free the record on encryption error")
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Simon Horman <simon.horman@...ronome.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/tls/tls_sw.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -793,7 +793,7 @@ static int bpf_exec_tx_verdict(struct sk
 	psock = sk_psock_get(sk);
 	if (!psock || !policy) {
 		err = tls_push_record(sk, flags, record_type);
-		if (err) {
+		if (err && err != -EINPROGRESS) {
 			*copied -= sk_msg_free(sk, msg);
 			tls_free_open_rec(sk);
 		}
@@ -819,7 +819,7 @@ more_data:
 	switch (psock->eval) {
 	case __SK_PASS:
 		err = tls_push_record(sk, flags, record_type);
-		if (err < 0) {
+		if (err && err != -EINPROGRESS) {
 			*copied -= sk_msg_free(sk, msg);
 			tls_free_open_rec(sk);
 			goto out_err;