linux-kernel - [PATCH] net: pch_gbe: Fix memory leaks

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Message-Id: <1565746427-5366-1-git-send-email-wenwen@cs.uga.edu>
Date:   Tue, 13 Aug 2019 20:33:45 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Richard Fontana <rfontana@...hat.com>,
        Allison Randal <allison@...utok.net>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] net: pch_gbe: Fix memory leaks

In pch_gbe_set_ringparam(), if netif_running() returns false, 'tx_old' and
'rx_old' are not deallocated, leading to memory leaks. To fix this issue,
move the free statements after the if branch.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c
index 1a3008e..ef6311cd 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c
@@ -340,12 +340,12 @@ static int pch_gbe_set_ringparam(struct net_device *netdev,
 			goto err_setup_tx;
 		pch_gbe_free_rx_resources(adapter, rx_old);
 		pch_gbe_free_tx_resources(adapter, tx_old);
-		kfree(tx_old);
-		kfree(rx_old);
 		adapter->rx_ring = rxdr;
 		adapter->tx_ring = txdr;
 		err = pch_gbe_up(adapter);
 	}
+	kfree(tx_old);
+	kfree(rx_old);
 	return err;
 
 err_setup_tx:
-- 
2.7.4