net/tls: don't leak partially sent record in device mode

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>

diff --git a/include/net/tls.h b/include/net/tls.h
index a5a9385..c7f7dc3 100644 (file)
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -307,6 +307,7 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 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);
@@ -330,6 +331,7 @@ int tls_push_sg(struct sock *sk, struct tls_context *ctx,
                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);
 
 static inline struct tls_msg *tls_msg(struct sk_buff *skb)
 {

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 38b3b2a..9f3bdbc 100644 (file)
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -219,6 +219,13 @@ void tls_device_sk_destruct(struct sock *sk)
 }
 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)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index df921a2..a3cca1e 100644 (file)
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -208,6 +208,26 @@ int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
        return tls_push_sg(sk, ctx, sg, offset, 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);
@@ -267,6 +287,8 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
                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) {

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 20b1912..b50ced8 100644 (file)
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -2052,20 +2052,7 @@ void tls_sw_free_resources_tx(struct sock *sk)
        /* 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);