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authorThomas Falcon <tlfalcon@linux.vnet.ibm.com>2018-02-06 17:25:23 -0600
committerDavid S. Miller <davem@davemloft.net>2018-02-07 21:55:52 -0500
commitb0992eca00c490c0923044b7d8b853c212b3cacc (patch)
treee0354ccb0dbd5010fec741eea1838adc516a4cfc /drivers
parent3468656fd7599b0cb1092bb1ee717d1a984e93ee (diff)
ibmvnic: Ensure that buffers are NULL after free
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/ibm/ibmvnic.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 8dc8fc503750..8dabc9d9dfa6 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;
}

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