[PATCH AUTOSEL 3.18 3/4] e1000: ensure to free old tx/rx rings in set_ringparam()

From: Sasha Levin
Date: Wed Sep 19 2018 - 22:50:22 EST

From: Bo Chen <chenbo@xxxxxxx>

[ Upstream commit ee400a3f1bfe7004a3e14b81c38ccc5583c26295 ]

In 'e1000_set_ringparam()', the tx_ring and rx_ring are updated with new value
and the old tx/rx rings are freed only when the device is up. There are resource
leaks on old tx/rx rings when the device is not up. This bug is reported by COD,
a tool for testing kernel module binaries I am building.

This patch fixes the bug by always calling 'kfree()' on old tx/rx rings in

Signed-off-by: Bo Chen <chenbo@xxxxxxx>
Reviewed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
drivers/net/ethernet/intel/e1000/e1000_ethtool.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
index ab3d94d0c731..615d2145f411 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
@@ -646,14 +646,14 @@ static int e1000_set_ringparam(struct net_device *netdev,
adapter->tx_ring = tx_old;
- kfree(tx_old);
- kfree(rx_old);
adapter->rx_ring = rxdr;
adapter->tx_ring = txdr;
err = e1000_up(adapter);
if (err)
goto err_setup;
+ kfree(tx_old);
+ kfree(rx_old);

clear_bit(__E1000_RESETTING, &adapter->flags);
return 0;