Re: [PATCH -next] ocxl: Fix return value check in afu_ioctl()

[Andrew Donnellan <ajd@linux.ibm.com>]

On 4/5/19 5:04 pm, Wei Yongjun wrote:
> In case of error, the function eventfd_ctx_fdget() returns ERR_PTR() and
> never returns NULL. The NULL test in the return value check should be
> replaced with IS_ERR().
> 
> This issue was detected by using the Coccinelle software.
> 
> Fixes: 060146614643 ("ocxl: move event_fd handling to frontend")
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>

Acked-by: Andrew Donnellan <ajd@linux.ibm.com>

> ---
>   drivers/misc/ocxl/file.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
> index 8aa22893ed76..2870c25da166 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -257,8 +257,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
>   			return -EINVAL;
>   		irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
>   		ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd);
> -		if (!ev_ctx)
> -			return -EFAULT;
> +		if (IS_ERR(ev_ctx))
> +			return PTR_ERR(ev_ctx);
>   		rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
>   		break;
> 
> 
> 

-- 
Andrew Donnellan              OzLabs, ADL Canberra
ajd@linux.ibm.com             IBM Australia Limited