Re: [PATCH next] Drivers: hv: mshv: Prevent potential NULL dereference

[Nuno Das Neves <nunodasneves@linux.microsoft.com>]

On 3/21/2025 7:35 AM, Dan Carpenter wrote:
> Move the NULL check on "partition" before the dereference.
> 
> Fixes: f5288d14069b ("Drivers: hv: Introduce mshv_root module to expose /dev/mshv to VMMs")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
>  drivers/hv/mshv_synic.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/hv/mshv_synic.c b/drivers/hv/mshv_synic.c
> index a3daedd680ff..88949beb5e37 100644
> --- a/drivers/hv/mshv_synic.c
> +++ b/drivers/hv/mshv_synic.c
> @@ -151,13 +151,12 @@ static bool mshv_async_call_completion_isr(struct hv_message *msg)
>  	rcu_read_lock();
>  
>  	partition = mshv_partition_find(partition_id);
> -	partition->async_hypercall_status = async_msg->status;
> -
>  	if (unlikely(!partition)) {
>  		pr_debug("failed to find partition %llu\n", partition_id);
>  		goto unlock_out;
>  	}
>  
> +	partition->async_hypercall_status = async_msg->status;
>  	complete(&partition->async_hypercall);
>  
>  	handled = true;

Thanks for catching this one!
Wei could you please apply or squash this into the driver patch?

Thanks
Nuno