tls: device: push pending open record on splice EOF

[ Upstream commit eaa39f9 ]

On kTLS device-offload sockets, sendfile() with count > EOF can reach
->splice_eof() with a fully assembled but still-open TLS record left
pending. tls_device_splice_eof() only flushes partially sent records,
so an abrupt close() can drop the final record and the peer receives
a short file.

Fix tls_device_splice_eof() to also push pending open records.
This matches the software path, where splice EOF already flushes
pending open records.

Fixes: d4c1e80 ("tls/device: Use splice_eof() to flush")
Link: https://lore.kernel.org/netdev/CAMPsyauZ+jzG9AysO0FWv6ZY0kvCUpjX_U7o=oOjCuOQ87BCgg@mail.gmail.com/
Reported-by: Nils Juenemann <nils.juenemann@gmail.com>
Signed-off-by: Rishikesh Jethwani <rjethwani@purestorage.com>
Tested-by: Nils Juenemann <nils.juenemann@gmail.com>
Link: https://patch.msgid.link/20260709224436.1608993-2-rjethwani@purestorage.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Rishikesh Jethwani

net/tls/tls_device.c

@@ -594,13 +594,15 @@ void tls_device_splice_eof(struct socket *sock)
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct iov_iter iter = {};
 
-	if (!tls_is_partially_sent_record(tls_ctx))
+	if (!tls_is_partially_sent_record(tls_ctx) &&
+	    !tls_is_pending_open_record(tls_ctx))
 		return;
 
 	mutex_lock(&tls_ctx->tx_lock);
 	lock_sock(sk);
 
-	if (tls_is_partially_sent_record(tls_ctx)) {
+	if (tls_is_partially_sent_record(tls_ctx) ||
+	    tls_is_pending_open_record(tls_ctx)) {
 		iov_iter_bvec(&iter, ITER_SOURCE, NULL, 0, 0);
 		tls_push_data(sk, &iter, 0, 0, TLS_RECORD_TYPE_DATA);
 	}