linux-kernel - Re: [PATCH] misc: ocxl: fix possible refcount leak in afu

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Date:   Wed, 24 Aug 2022 11:42:37 +0200
From:   Frederic Barrat <fbarrat@...ux.ibm.com>
To:     Hangyu Hua <hbh25y@...il.com>, ajd@...ux.ibm.com, arnd@...db.de,
        gregkh@...uxfoundation.org, alastair@...ilva.org,
        mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] misc: ocxl: fix possible refcount leak in afu_ioctl()



On 24/08/2022 10:26, Hangyu Hua wrote:
> eventfd_ctx_put need to be called to put the refcount that gotten by
> eventfd_ctx_fdget when ocxl_irq_set_handler fails.
> 
> Fixes: 060146614643 ("ocxl: move event_fd handling to frontend")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
> ---


Thanks for fixing it! LGTM

Acked-by: Frederic Barrat <fbarrat@...ux.ibm.com>

   Fred


>   drivers/misc/ocxl/file.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
> index 6777c419a8da..d46dba2df5a1 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -257,6 +257,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
>   		if (IS_ERR(ev_ctx))
>   			return PTR_ERR(ev_ctx);
>   		rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
> +		if (rc)
> +			eventfd_ctx_put(ev_ctx);
>   		break;
>   
>   	case OCXL_IOCTL_GET_METADATA: