From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Fri, 19 Apr 2019 16:52:19 -0700
Subject: net/tls: don't leak IV and record seq when offload fails
Patch-mainline: v5.1-rc7
Git-commit: 12c7686111326148b4b5db189130522a4ad1be4a
References: bsc#1109837

When device refuses the offload in tls_set_device_offload_rx()
it calls tls_sw_free_resources_rx() to clean up software context
state.

Unfortunately, tls_sw_free_resources_rx() does not free all
the state tls_set_sw_offload() allocated - it leaks IV and
sequence number buffers.  All other code paths which lead to
tls_sw_release_resources_rx() (which tls_sw_free_resources_rx()
calls) free those right before the call.

Avoid the leak by moving freeing of iv and rec_seq into
tls_sw_release_resources_rx().

Fixes: 4799ac81e52a ("tls: Add rx inline crypto offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/tls/tls_device.c |    2 --
 net/tls/tls_main.c   |    5 +----
 net/tls/tls_sw.c     |    3 +++
 3 files changed, 4 insertions(+), 6 deletions(-)

--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -936,8 +936,6 @@ void tls_device_offload_cleanup_rx(struc
 	}
 out:
 	up_read(&device_offload_lock);
-	kfree(tls_ctx->rx.rec_seq);
-	kfree(tls_ctx->rx.iv);
 	tls_sw_release_resources_rx(sk);
 }
 
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -291,11 +291,8 @@ static void tls_sk_proto_close(struct so
 #endif
 	}
 
-	if (ctx->rx_conf == TLS_SW) {
-		kfree(ctx->rx.rec_seq);
-		kfree(ctx->rx.iv);
+	if (ctx->rx_conf == TLS_SW)
 		tls_sw_free_resources_rx(sk);
-	}
 
 #ifdef CONFIG_TLS_DEVICE
 	if (ctx->rx_conf == TLS_HW)
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1823,6 +1823,9 @@ void tls_sw_release_resources_rx(struct
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 
+	kfree(tls_ctx->rx.rec_seq);
+	kfree(tls_ctx->rx.iv);
+
 	if (ctx->aead_recv) {
 		kfree_skb(ctx->recv_pkt);
 		ctx->recv_pkt = NULL;