linux-kernel - Re: [PATCH] scsi: scsi_debug: fix return checks for kcalloc

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Date:   Thu, 4 Nov 2021 07:25:26 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     George Kennedy <george.kennedy@...cle.com>
Cc:     jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        dan.carpenter@...cle.com
Subject: Re: [PATCH] scsi: scsi_debug: fix return checks for kcalloc

On Wed, Nov 03, 2021 at 02:01:42PM -0500, George Kennedy wrote:
> Change return checks from kcalloc() to now check for NULL and
> ZERO_SIZE_PTR using the ZERO_OR_NULL_PTR macro or the following
> crash can occur if ZERO_SIZE_PTR indicator is returned.

That seems really broken in the api, why is kcalloc() returning
ZERO_SIZE_PTR?

Please fix that, otherwise you need to fix all callers in the kernel
tree.

thanks,

greg k-h