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From:   Fedor Pchelkin <pchelkin@ispras.ru>
To:     Jon Maloy <jmaloy@redhat.com>
Cc:     Fedor Pchelkin <pchelkin@ispras.ru>,
        Ying Xue <ying.xue@windriver.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Xin Long <lucien.xin@gmail.com>, netdev@vger.kernel.org,
        tipc-discussion@lists.sourceforge.net,
        linux-kernel@vger.kernel.org,
        Alexey Khoroshilov <khoroshilov@ispras.ru>,
        lvc-project@linuxtesting.org
Subject: [PATCH v2] tipc: stop tipc crypto on failure in tipc_node_create
Date:   Wed, 26 Jul 2023 00:46:25 +0300
Message-ID: <20230725214628.25246-1-pchelkin@ispras.ru>
In-Reply-To: <cyninzffkwhc7mqbxpwhhpm7bav67tp7a7rqkpeu5bh3kafbyo@wx3q2x5nm3he>
References: 
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If tipc_link_bc_create() fails inside tipc_node_create() for a newly
allocated tipc node then we should stop its tipc crypto and free the
resources allocated with a call to tipc_crypto_start().

As the node ref is initialized to one to that point, just put the ref on
tipc_link_bc_create() error case that would lead to tipc_node_free() be
eventually executed and properly clean the node and its crypto resources.

Found by Linux Verification Center (linuxtesting.org).

Fixes: cb8092d70a6f ("tipc: move bc link creation back to tipc_node_create")
Suggested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
---
v1->v2: simplify the patch per Xin Long's advice: putting the ref on error
case would solve the problem more conveniently; update the patch
description accordingly.

 net/tipc/node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 5e000fde8067..a9c5b6594889 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -583,7 +583,7 @@ struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
 				 n->capabilities, &n->bc_entry.inputq1,
 				 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
 		pr_warn("Broadcast rcv link creation failed, no memory\n");
-		kfree(n);
+		tipc_node_put(n);
 		n = NULL;
 		goto exit;
 	}
-- 
2.41.0