From 02b1fa07bb58f5d1f349b5b09eb936739a7b20fc Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 5 Nov 2019 14:24:34 -0800 Subject: net/tls: don't pay attention to sk_write_pending when pushing partial records sk_write_pending being not zero does not guarantee that partial record will be pushed. If the thread waiting for memory times out the pending record may get stuck. In case of tls_device there is no path where parial record is set and writer present in the first place. Partial record is set only in tls_push_sg() and tls_push_sg() will return an error immediately. All tls_device callers of tls_push_sg() will return (and not wait for memory) if it failed. Fixes: a42055e8d2c3 ("net/tls: Add support for async encryption of records for performance") Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman Signed-off-by: David S. Miller --- net/tls/tls_device.c | 4 +++- net/tls/tls_sw.c | 9 +++------ 2 files changed, 6 insertions(+), 7 deletions(-) (limited to 'net/tls') diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index f959487c5cd1..5a3715ddc592 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -623,9 +623,11 @@ static int tls_device_push_pending_record(struct sock *sk, int flags) void tls_device_write_space(struct sock *sk, struct tls_context *ctx) { - if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) { + if (tls_is_partially_sent_record(ctx)) { gfp_t sk_allocation = sk->sk_allocation; + WARN_ON_ONCE(sk->sk_write_pending); + sk->sk_allocation = GFP_ATOMIC; tls_push_partial_record(sk, ctx, MSG_DONTWAIT | MSG_NOSIGNAL | diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index c2b5e0d2ba1a..e155b792df0b 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -2180,12 +2180,9 @@ void tls_sw_write_space(struct sock *sk, struct tls_context *ctx) struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); /* Schedule the transmission if tx list is ready */ - if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { - /* Schedule the transmission */ - if (!test_and_set_bit(BIT_TX_SCHEDULED, - &tx_ctx->tx_bitmask)) - schedule_delayed_work(&tx_ctx->tx_work.work, 0); - } + if (is_tx_ready(tx_ctx) && + !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) + schedule_delayed_work(&tx_ctx->tx_work.work, 0); } void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx) -- cgit v1.2.3-58-ga151