[PATCH v2] vdpa/ifc: fix null pointer dereference

[Maxime Coquelin]

On 6/15/22 08:23, Andy Pei wrote:
> Fix null pointer dereference reported in coverity scan.
> 
> Coverity issue: 378882
> Fixes: 5d75517beffe ("vdpa/ifc/base: access correct register for blk device")
> 
> Signed-off-by: Andy Pei <andy.pei at intel.com>
> Acked-by: Xiao Wang <xiao.w.wang at intel.com>
> ---
>   drivers/vdpa/ifc/base/ifcvf.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c
> index dd475a7..0a9f71a 100644
> --- a/drivers/vdpa/ifc/base/ifcvf.c
> +++ b/drivers/vdpa/ifc/base/ifcvf.c
> @@ -255,6 +255,10 @@
>   	u32 ring_state;
>   
>   	cfg = hw->common_cfg;
> +	if (!cfg) {
> +		DEBUGOUT("common_cfg in HW is NULL.\n");
> +		return;
> +	}
>   
>   	IFCVF_WRITE_REG16(IFCVF_MSI_NO_VECTOR, &cfg->msix_config);
>   	for (i = 0; i < hw->nr_vring; i++) {
> @@ -262,6 +266,11 @@
>   		IFCVF_WRITE_REG16(0, &cfg->queue_enable);
>   		IFCVF_WRITE_REG16(IFCVF_MSI_NO_VECTOR, &cfg->queue_msix_vector);
>   
> +		if (!hw->lm_cfg) {
> +			DEBUGOUT("live migration cfg in HW is NULL.\n");
> +			continue;
> +		}
> +
>   		if (hw->device_type == IFCVF_BLK)
>   			ring_state = *(u32 *)(hw->lm_cfg +
>   					IFCVF_LM_RING_STATE_OFFSET +

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime