linux-kernel - [PATCH 5.3 022/193] net/smc: fix ethernet interface refcounting

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Date:   Mon, 11 Nov 2019 19:26:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ursula Braun <ubraun@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.3 022/193] net/smc: fix ethernet interface refcounting

From: Ursula Braun <ubraun@...ux.ibm.com>

[ Upstream commit 98f3375505b8d6517bd6710bc6d4f6289eeb30aa ]

If a pnet table entry is to be added mentioning a valid ethernet
interface, but an invalid infiniband or ISM device, the dev_put()
operation for the ethernet interface is called twice, resulting
in a negative refcount for the ethernet interface, which disables
removal of such a network interface.

This patch removes one of the dev_put() calls.

Fixes: 890a2cb4a966 ("net/smc: rework pnet table")
Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/smc/smc_pnet.c |    2 --
 1 file changed, 2 deletions(-)

--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -376,8 +376,6 @@ static int smc_pnet_fill_entry(struct ne
 	return 0;
 
 error:
-	if (pnetelem->ndev)
-		dev_put(pnetelem->ndev);
 	return rc;
 }