linux-kernel - Re: [PATCH 2/3] lkdtm/perms: Check possible NULL pointer returned by kmalloc(),vmalloc()

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Date:   Tue, 26 Jul 2022 13:43:41 +0800
From:   tury <renyu@...china.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     keescook@...omium.org, arnd@...db.de, linux-kernel@...r.kernel.org,
        liqiong@...china.com, yuzhe@...china.com
Subject: Re: [PATCH 2/3] lkdtm/perms: Check possible NULL pointer returned by
 kmalloc(),vmalloc()

在 2022年07月25日 20:37, Greg KH 写道:
> A: http://en.wikipedia.org/wiki/Top_post
> Q: Were do I find info about this thing called top-posting?
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
> Q: What is the most annoying thing in e-mail?
>
> A: No.
> Q: Should I include quotations after my reply?
>
> http://daringfireball.net/2007/07/on_top
>
> On Mon, Jul 25, 2022 at 05:54:15PM +0800, tury wrote:
>> When there is insufficient memory, the allocation will fail.
> And have you ever seen that happen here?  The issue is for small
> allocations, they never will fail.
>
>> the return value is void,so i think it is ok .
> Why?
Because the function lkdtm_EXEC_KMALLOC()   declaration is void,and The 
return value is not checked elsewhere.
Should I add some warning messages?
>
>> should i have changed comment to something like this ?
>>
>> As the possible alloc failure of the kmalloc() and vmalloc(),
>> the return pointer could be NULL.therefore it should be better to check it.
> Please wrap your lines properly, and use '.' correctly.
>
> thanks,
>
> greg k-h
Thank you for your help and patience,
>