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Subject[PATCH 5.0 023/115] net/tls: dont leak partially sent record in device mode
Date
From: Jakub Kicinski <jakub.kicinski@netronome.com>

[ Upstream commit 35b71a34ada62c9573847a324bf06a133fe11b11 ]

David reports that tls triggers warnings related to
sk->sk_forward_alloc not being zero at destruction time:

WARNING: CPU: 5 PID: 6831 at net/core/stream.c:206 sk_stream_kill_queues+0x103/0x110
WARNING: CPU: 5 PID: 6831 at net/ipv4/af_inet.c:160 inet_sock_destruct+0x15b/0x170

When sender fills up the write buffer and dies from
SIGPIPE. This is due to the device implementation
not cleaning up the partially_sent_record.

This is because commit a42055e8d2c3 ("net/tls: Add support for async encryption of records for performance")
moved the partial record cleanup to the SW-only path.

Fixes: a42055e8d2c3 ("net/tls: Add support for async encryption of records for performance")
Reported-by: David Beckett <david.beckett@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/net/tls.h | 2 ++
net/tls/tls_device.c | 7 +++++++
net/tls/tls_main.c | 22 ++++++++++++++++++++++
net/tls/tls_sw.c | 15 +--------------
4 files changed, 32 insertions(+), 14 deletions(-)

--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -289,6 +289,7 @@ int tls_device_sendmsg(struct sock *sk,
int tls_device_sendpage(struct sock *sk, struct page *page,
int offset, size_t size, int flags);
void tls_device_sk_destruct(struct sock *sk);
+void tls_device_free_resources_tx(struct sock *sk);
void tls_device_init(void);
void tls_device_cleanup(void);
int tls_tx_records(struct sock *sk, int flags);
@@ -312,6 +313,7 @@ int tls_push_sg(struct sock *sk, struct
int flags);
int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
int flags);
+bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx);

int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
int flags, long *timeo);
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -219,6 +219,13 @@ void tls_device_sk_destruct(struct sock
}
EXPORT_SYMBOL(tls_device_sk_destruct);

+void tls_device_free_resources_tx(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+ tls_free_partial_record(sk, tls_ctx);
+}
+
static void tls_append_frag(struct tls_record_info *record,
struct page_frag *pfrag,
int size)
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -220,6 +220,26 @@ int tls_push_pending_closed_record(struc
return tls_ctx->push_pending_record(sk, flags);
}

+bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
+{
+ struct scatterlist *sg;
+
+ sg = ctx->partially_sent_record;
+ if (!sg)
+ return false;
+
+ while (1) {
+ put_page(sg_page(sg));
+ sk_mem_uncharge(sk, sg->length);
+
+ if (sg_is_last(sg))
+ break;
+ sg++;
+ }
+ ctx->partially_sent_record = NULL;
+ return true;
+}
+
static void tls_write_space(struct sock *sk)
{
struct tls_context *ctx = tls_get_ctx(sk);
@@ -278,6 +298,8 @@ static void tls_sk_proto_close(struct so
kfree(ctx->tx.rec_seq);
kfree(ctx->tx.iv);
tls_sw_free_resources_tx(sk);
+ } else if (ctx->tx_conf == TLS_HW) {
+ tls_device_free_resources_tx(sk);
}

if (ctx->rx_conf == TLS_SW) {
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1804,20 +1804,7 @@ void tls_sw_free_resources_tx(struct soc
/* Free up un-sent records in tx_list. First, free
* the partially sent record if any at head of tx_list.
*/
- if (tls_ctx->partially_sent_record) {
- struct scatterlist *sg = tls_ctx->partially_sent_record;
-
- while (1) {
- put_page(sg_page(sg));
- sk_mem_uncharge(sk, sg->length);
-
- if (sg_is_last(sg))
- break;
- sg++;
- }
-
- tls_ctx->partially_sent_record = NULL;
-
+ if (tls_free_partial_record(sk, tls_ctx)) {
rec = list_first_entry(&ctx->tx_list,
struct tls_rec, list);
list_del(&rec->list);

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