[patch 033/100] ixgbe: Fix potential memory leak/driver panic issue while setting up Tx & Rx ring parameters

Chris Wright
2009-04-23T07:38:24Z

[-- Attachment #1: ixgbe-fix-potential-memory-leak-driver-panic-issue-while-setting-up-tx-rx-ring-parameters.patch --]
[-- Type: text/plain, Size: 5550 bytes --]

-stable review patch. If anyone has any objections, please let us know.
---------------------

From: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>

upstream commit: f9ed88549e2ec73922b788e3865282d221233662

While setting up the ring parameters using ethtool the driver can
panic or leak memory as ixgbe_open tries to setup tx & rx resources.
The updated logic will use ixgbe_down/up after successful allocation of
tx & rx resources

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
drivers/net/ixgbe/ixgbe_ethtool.c | 103 +++++++++++++++++++++-----------------
1 file changed, 59 insertions(+), 44 deletions(-)

--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -691,9 +691,10 @@ static int ixgbe_set_ringparam(struct ne
struct ethtool_ringparam *ring)
{
struct ixgbe_adapter *adapter = netdev_priv(netdev);
- struct ixgbe_ring *temp_ring;
+ struct ixgbe_ring *temp_tx_ring, *temp_rx_ring;
int i, err;
u32 new_rx_count, new_tx_count;
+ bool need_update = false;

if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
return -EINVAL;
@@ -712,80 +713,94 @@ static int ixgbe_set_ringparam(struct ne
return 0;
}

- temp_ring = kcalloc(adapter->num_tx_queues,
- sizeof(struct ixgbe_ring), GFP_KERNEL);
- if (!temp_ring)
- return -ENOMEM;
-
while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
msleep(1);

- if (new_tx_count != adapter->tx_ring->count) {
+ temp_tx_ring = kcalloc(adapter->num_tx_queues,
+ sizeof(struct ixgbe_ring), GFP_KERNEL);
+ if (!temp_tx_ring) {
+ err = -ENOMEM;
+ goto err_setup;
+ }
+
+ if (new_tx_count != adapter->tx_ring_count) {
+ memcpy(temp_tx_ring, adapter->tx_ring,
+ adapter->num_tx_queues * sizeof(struct ixgbe_ring));
for (i = 0; i < adapter->num_tx_queues; i++) {
- temp_ring[i].count = new_tx_count;
- err = ixgbe_setup_tx_resources(adapter, &temp_ring[i]);
+ temp_tx_ring[i].count = new_tx_count;
+ err = ixgbe_setup_tx_resources(adapter,
+ &temp_tx_ring[i]);
if (err) {
while (i) {
i--;
ixgbe_free_tx_resources(adapter,
- &temp_ring[i]);
+ &temp_tx_ring[i]);
}
goto err_setup;
}
- temp_ring[i].v_idx = adapter->tx_ring[i].v_idx;
+ temp_tx_ring[i].v_idx = adapter->tx_ring[i].v_idx;
}
- if (netif_running(netdev))
- netdev->netdev_ops->ndo_stop(netdev);
- ixgbe_reset_interrupt_capability(adapter);
- ixgbe_napi_del_all(adapter);
- INIT_LIST_HEAD(&netdev->napi_list);
- kfree(adapter->tx_ring);
- adapter->tx_ring = temp_ring;
- temp_ring = NULL;
- adapter->tx_ring_count = new_tx_count;
- }
-
- temp_ring = kcalloc(adapter->num_rx_queues,
- sizeof(struct ixgbe_ring), GFP_KERNEL);
- if (!temp_ring) {
- if (netif_running(netdev))
- netdev->netdev_ops->ndo_open(netdev);
- return -ENOMEM;
+ need_update = true;
}

- if (new_rx_count != adapter->rx_ring->count) {
+ temp_rx_ring = kcalloc(adapter->num_rx_queues,
+ sizeof(struct ixgbe_ring), GFP_KERNEL);
+ if ((!temp_rx_ring) && (need_update)) {
+ for (i = 0; i < adapter->num_tx_queues; i++)
+ ixgbe_free_tx_resources(adapter, &temp_tx_ring[i]);
+ kfree(temp_tx_ring);
+ err = -ENOMEM;
+ goto err_setup;
+ }
+
+ if (new_rx_count != adapter->rx_ring_count) {
+ memcpy(temp_rx_ring, adapter->rx_ring,
+ adapter->num_rx_queues * sizeof(struct ixgbe_ring));
for (i = 0; i < adapter->num_rx_queues; i++) {
- temp_ring[i].count = new_rx_count;
- err = ixgbe_setup_rx_resources(adapter, &temp_ring[i]);
+ temp_rx_ring[i].count = new_rx_count;
+ err = ixgbe_setup_rx_resources(adapter,
+ &temp_rx_ring[i]);
if (err) {
while (i) {
i--;
ixgbe_free_rx_resources(adapter,
- &temp_ring[i]);
+ &temp_rx_ring[i]);
}
goto err_setup;
}
- temp_ring[i].v_idx = adapter->rx_ring[i].v_idx;
+ temp_rx_ring[i].v_idx = adapter->rx_ring[i].v_idx;
}
+ need_update = true;
+ }
+
+ /* if rings need to be updated, here's the place to do it in one shot */
+ if (need_update) {
if (netif_running(netdev))
- netdev->netdev_ops->ndo_stop(netdev);
- ixgbe_reset_interrupt_capability(adapter);
- ixgbe_napi_del_all(adapter);
- INIT_LIST_HEAD(&netdev->napi_list);
- kfree(adapter->rx_ring);
- adapter->rx_ring = temp_ring;
- temp_ring = NULL;
+ ixgbe_down(adapter);
+
+ /* tx */
+ if (new_tx_count != adapter->tx_ring_count) {
+ kfree(adapter->tx_ring);
+ adapter->tx_ring = temp_tx_ring;
+ temp_tx_ring = NULL;
+ adapter->tx_ring_count = new_tx_count;
+ }

- adapter->rx_ring_count = new_rx_count;
+ /* rx */
+ if (new_rx_count != adapter->rx_ring_count) {
+ kfree(adapter->rx_ring);
+ adapter->rx_ring = temp_rx_ring;
+ temp_rx_ring = NULL;
+ adapter->rx_ring_count = new_rx_count;
+ }
}

/* success! */
err = 0;
-err_setup:
- ixgbe_init_interrupt_scheme(adapter);
if (netif_running(netdev))
- netdev->netdev_ops->ndo_open(netdev);
+ ixgbe_up(adapter);

+err_setup:
clear_bit(__IXGBE_RESETTING, &adapter->state);
return err;
}