netdev - [PATCHv2] net/tls: avoid TCP window full during ->read

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Message-Id: <20230807071022.10091-1-hare@suse.de>
Date: Mon,  7 Aug 2023 09:10:22 +0200
From: Hannes Reinecke <hare@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>,
	Keith Busch <kbusch@...nel.org>,
	linux-nvme@...ts.infradead.org,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	Hannes Reinecke <hare@...e.de>
Subject: [PATCHv2] net/tls: avoid TCP window full during ->read_sock()

When flushing the backlog after decoding a record we don't really
know how much data the caller want us to evaluate, so use INT_MAX
and 0 as arguments to tls_read_flush_backlog() to ensure we flush
at 128k of data. Otherwise we might be reading too much data and
trigger a TCP window full.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Hannes Reinecke <hare@...e.de>
---
 net/tls/tls_sw.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 9c1f13541708..5c122d7bb784 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -2240,7 +2240,6 @@ int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
 			tlm = tls_msg(skb);
 		} else {
 			struct tls_decrypt_arg darg;
-			int to_decrypt;
 
 			err = tls_rx_rec_wait(sk, NULL, true, released);
 			if (err <= 0)
@@ -2248,20 +2247,18 @@ int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
 
 			memset(&darg.inargs, 0, sizeof(darg.inargs));
 
-			rxm = strp_msg(tls_strp_msg(ctx));
-			tlm = tls_msg(tls_strp_msg(ctx));
-
-			to_decrypt = rxm->full_len - prot->overhead_size;
-
 			err = tls_rx_one_record(sk, NULL, &darg);
 			if (err < 0) {
 				tls_err_abort(sk, -EBADMSG);
 				goto read_sock_end;
 			}
 
-			released = tls_read_flush_backlog(sk, prot, rxm->full_len, to_decrypt,
-							  decrypted, &flushed_at);
+			released = tls_read_flush_backlog(sk, prot, INT_MAX,
+							  0, decrypted,
+							  &flushed_at);
 			skb = darg.skb;
+			rxm = strp_msg(skb);
+			tlm = tls_msg(skb);
 			decrypted += rxm->full_len;
 
 			tls_rx_rec_done(ctx);
-- 
2.35.3