netdev - [PATCH net] net: tls: fix device-offloaded sendpage straddling records

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Date:   Sat,  4 Mar 2023 11:26:10 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        Jakub Kicinski <kuba@...nel.org>,
        Adrien Moulin <amoulin@...p.free.fr>, borisp@...dia.com,
        john.fastabend@...il.com, tariqt@...dia.com, maximmi@...dia.com,
        maxtram95@...il.com
Subject: [PATCH net] net: tls: fix device-offloaded sendpage straddling records

Adrien reports that incorrect data is transmitted when a single
page straddles multiple records. We would transmit the same
data in all iterations of the loop.

Reported-by: Adrien Moulin <amoulin@...p.free.fr>
Link: https://lore.kernel.org/all/61481278.42813558.1677845235112.JavaMail.zimbra@corp.free.fr
Fixes: c1318b39c7d3 ("tls: Add opt-in zerocopy mode of sendfile()")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: borisp@...dia.com
CC: john.fastabend@...il.com
CC: tariqt@...dia.com
CC: maximmi@...dia.com
CC: maxtram95@...il.com

Adrien, would you mind sending an official Tested-by: tag
in reply to this patch?

Maxim, can I add a .mailmap entry for you? get_maintainers
will complain if I don't CC your @nvidia address :(
---
 net/tls/tls_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 6c593788dc25..a7cc4f9faac2 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -508,6 +508,8 @@ static int tls_push_data(struct sock *sk,
 			zc_pfrag.offset = iter_offset.offset;
 			zc_pfrag.size = copy;
 			tls_append_frag(record, &zc_pfrag, copy);
+
+			iter_offset.offset += copy;
 		} else if (copy) {
 			copy = min_t(size_t, copy, pfrag->size - pfrag->offset);
 
-- 
2.39.2