linux-kernel - Re: [PATCH] staging: greybus: Fix potential NULL dereference

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Date:   Fri, 11 Mar 2022 14:32:08 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Haowen Bai <baihaowen@...zu.com>
Cc:     vireshk@...nel.org, johan@...nel.org, elder@...nel.org,
        gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: Fix potential NULL dereference

On Fri, Mar 11, 2022 at 04:35:30PM +0800, Haowen Bai wrote:
> Fix following coccicheck warning:
> drivers/staging/greybus/bootrom.c:301:35-39: ERROR: fw is NULL but dereferenced.
> 
> When goto queue_work but dereference Uninitialized fw will trigger a NULL 
> dereference.
> 
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>

Your patch claims to fix a bug, but the warning is a false positive.
When we "goto queue_work;" then "ret = -EINVAL" so that means that we
will not dereference "fw".

You should ignore false positive warnings.

We would apply the patch only if it made the code more readable but I
do not think that is the case here.  I do not really even see how the
patch silences the false positive warning, but it may do...

Anyway, the point is:  False positive.  Ignore it.

regards,
dan carpenter