[PATCH] vdpa/ifc: fix null pointer dereference

[Xia, Chenbo]

Hi Andy,

> -----Original Message-----
> From: Pei, Andy <andy.pei at intel.com>
> Sent: Wednesday, June 8, 2022 3:34 PM
> To: dev at dpdk.org
> Cc: Xia, Chenbo <chenbo.xia at intel.com>; maxime.coquelin at redhat.com; Wang,
> Xiao W <xiao.w.wang at intel.com>; Xu, Rosen <rosen.xu at intel.com>; Xiao,
> QimaiX <qimaix.xiao at intel.com>
> Subject: [PATCH] vdpa/ifc: fix null pointer dereference
> 
> Fix null pointer dereference reported in coverity scan.
> 
> Coverity issue: 378882
> Fixes: 8162a4a9 ("vdpa/ifc/base: access correct register for blk device")

Commit id need to be 12 digits. Also pls leave a blank line between Fixes tag and signed-off

Thanks,
Chenbo

> Signed-off-by: Andy Pei <andy.pei 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 +
> --
> 1.8.3.1