Re: [PATCH v2 1/9] libata: fix ata_host_alloc_pinfo()

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On 8/6/21 9:42 AM, Damien Le Moal wrote:
> Avoid a potential NULL pointer dereference by testing that the ATA port
> info variable "pi".
> 
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
> ---
>  drivers/ata/libata-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 61c762961ca8..ea8b91297f12 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
>  		ap->link.flags |= pi->link_flags;
>  		ap->ops = pi->port_ops;
>  
> -		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
> +		if (!host->ops && pi && pi->port_ops != &ata_dummy_port_ops)
>  			host->ops = pi->port_ops;
>  	}
>  
> 
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@xxxxxxx			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer



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