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[Bionic,09/19] ibmvnic: Ensure that buffers are NULL after free

Message ID 20180227151215.30417-10-cascardo@canonical.com
State New
Headers show
Series Update ibmvnic to latest upstream changes | expand

Commit Message

Thadeu Lima de Souza Cascardo Feb. 27, 2018, 3:12 p.m. UTC 
From: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1748517

This change will guard against a double free in the case that the
buffers were previously freed at some other time, such as during
a device reset. It resolves a kernel oops that occurred when changing
the VNIC device's MTU.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit b0992eca00c490c0923044b7d8b853c212b3cacc)
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index d1a8f55a7329..fab1d1f3f815 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -354,6 +354,8 @@  static void release_stats_buffers(struct ibmvnic_adapter *adapter)
 {
 	kfree(adapter->tx_stats_buffers);
 	kfree(adapter->rx_stats_buffers);
+	adapter->tx_stats_buffers = NULL;
+	adapter->rx_stats_buffers = NULL;
 }
 
 static int init_stats_buffers(struct ibmvnic_adapter *adapter)
@@ -599,6 +601,8 @@  static void release_vpd_data(struct ibmvnic_adapter *adapter)
 
 	kfree(adapter->vpd->buff);
 	kfree(adapter->vpd);
+
+	adapter->vpd = NULL;
 }
 
 static void release_tx_pools(struct ibmvnic_adapter *adapter)
@@ -909,6 +913,7 @@  static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
 	if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
 		dev_err(dev, "Could not map VPD buffer\n");
 		kfree(adapter->vpd->buff);
+		adapter->vpd->buff = NULL;
 		return -ENOMEM;
 	}