linux-kernel - Re: [PATCH] firmware: arm_scmi: Fix late checks on pointer dereference

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Message-ID: <20220504064436.GJ4031@kadam>
Date:   Wed, 4 May 2022 09:44:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sudeep.holla@....com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] firmware: arm_scmi: Fix late checks on pointer
 dereference

On Tue, May 03, 2022 at 01:10:47PM +0100, Cristian Marussi wrote:
> A few dereferences could happen before the iterator pointer argument was
> checked for NULL, causing the following smatch warnings:
> 
> drivers/firmware/arm_scmi/driver.c:1214 scmi_iterator_run() warn: variable
> dereferenced before check 'i' (see line 1210)
> 
> Fix by moving the checks early and dropping some unneeded local references.
> 
> No functional change.

If there is no chance these can be NULL then a different option is to
just delete the NULL checks.

regards,
dan carpenter