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

["Morten Brørup" <mb@smartsharesystems.com>]

> From: Roger B Melton [mailto:rmelton@cisco.com]
> Sent: Saturday, 26 October 2024 16.34
> 
> 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

Acked-by: Morten Brørup <mb@smartsharesystems.com>