linux-kernel - Re: [PATCH] firmware: arm_scmi: check return value of idr

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Message-Id: <55DFE6B7-B936-4F15-98C0-69F425D51665@umn.edu>
Date:   Fri, 22 Mar 2019 21:18:19 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: arm_scmi: check return value of idr_find



> On Mar 8, 2019, at 10:02 PM, Kangjie Lu <kjlu@....edu> wrote:
> 
> idr_find may return NULL, so check its return value and return an
> error code.

Can someone review this patch? Thanks.

> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
> drivers/firmware/arm_scmi/driver.c | 2 ++
> 1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 8f952f2f1a29..35faa203d549 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -709,6 +709,8 @@ scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev, int prot_id)
> 
> 	if (scmi_mailbox_check(np)) {
> 		cinfo = idr_find(&info->tx_idr, SCMI_PROTOCOL_BASE);
> +		if (!cinfo)
> +			return -EINVAL;
> 		goto idr_alloc;
> 	}
> 
> -- 
> 2.17.1
>