[PATCH] net/vmxnet3: Fix vmxnet3 NULL pointer deref after configuration failure

[PATCH] net/vmxnet3: Fix vmxnet3 NULL pointer deref after configuration failure

[Roger B Melton]

Problem:

If vxmnet3_dev_configure() fails, applications may call
vmxnet3_dev_close(). If the failure occurs before the vmxnet3
hw->shared structure is allocated the close will lead to a segv.

Root Cause:

This crash is due to incorrect adapter_stopped state in the
vmxnet3 dev_private structure. When dev_private is allocated,
adapter_stopped will be 0 (FALSE).  eth_vmxnet3_dev_init() does not
set it to TRUE, so it will remain FALSE until a successful
vmxnet3_dev_start() followed by a vmxnet3_dev_stop().  When
vmxnet3_dev_close() is called, it will invoke vmxnet3_dev_stop().
vmxnet3_dev_stop() will check the adapter_stopped state in the
vmxnet3 shared data, find it is FALSE and will proceed to stop the
device, calling vmxnet3_disable_all_intrs().
vmxnet3_disable_all_intrs() attempts to access the vmxnet3 shared data
resulting in the segv.

Solution:

Set adapter_stopped to TRUE in eth_vmxnet3_dev_init(), to prevent stop
processing.

Signed-off-by: Roger B Melton <rmelton@cisco.com>
---
 drivers/net/vmxnet3/vmxnet3_ethdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index 467fb61137..8d7f95a753 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -403,6 +403,7 @@ eth_vmxnet3_dev_init(struct rte_eth_dev *eth_dev)
 	/* Vendor and Device ID need to be set before init of shared code */
 	hw->device_id = pci_dev->id.device_id;
 	hw->vendor_id = pci_dev->id.vendor_id;
+	hw->adapter_stopped = TRUE;
 	hw->hw_addr0 = (void *)pci_dev->mem_resource[0].addr;
 	hw->hw_addr1 = (void *)pci_dev->mem_resource[1].addr;
 
-- 
2.47.0