In pure sw ktls(AES-NI), -EAGAIN from tcp layer (do_tcp_sendpages for encrypted record) gets treated as error, subtracts the offset, and returns to application. Because of this, application sends data from subtracted offset, which leads to data integrity issue. Since record is already encrypted, ktls module marks it as partially sent and pushes the packet to tcp layer in the following iterations (either from bottom half or when pushing next chunk). So returning success in case of EAGAIN will fix the issue. Fixes: a42055e8d2c3 ("net/tls: Add support for async encryption") Signed-off-by: Pooja Trivedi <pooja.trivedi@xxxxxxxxxxxxx> Reviewed-by: Mallesham Jatharkonda <mallesham.jatharkonda@xxxxxxxxxxxxxxxxxx> Reviewed-by: Josh Tway <josh.tway@xxxxxxxxxxxxx> --- net/tls/tls_sw.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index e23f94a..d8ebdfc 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -415,10 +415,12 @@ int tls_tx_records(struct sock *sk, int flags) } tx_err: - if (rc < 0 && rc != -EAGAIN) + if (rc < 0 && rc != -EAGAIN) { tls_err_abort(sk, EBADMSG); + return rc; + } - return rc; + return 0; } static void tls_encrypt_done(struct crypto_async_request *req, int err) -- 1.8.3.1