linux-kernel - Re: [PATCH v4 1/1] test_fimware: return -ENOMEM instead of -ENOSPC on failed memory allocation

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Message-ID: <2023081213-reset-tadpole-fc94@gregkh>
Date:   Sat, 12 Aug 2023 09:29:42 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc:     linux-kernel@...r.kernel.org, Dan Carpenter <error27@...il.com>,
        Takashi Iwai <tiwai@...e.de>,
        Kees Cook <keescook@...omium.org>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Brian Norris <computersforpeace@...il.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v4 1/1] test_fimware: return -ENOMEM instead of -ENOSPC
 on failed memory allocation

On Sat, Aug 12, 2023 at 07:43:47AM +0200, Mirsad Todorovac wrote:
> [ Upstream commit 7dae593cd226a0bca61201cf85ceb9335cf63682 ]
> 
> In a couple of situations like
> 
> 	name = kstrndup(buf, count, GFP_KERNEL);
> 	if (!name)
> 		return -ENOSPC;
> 
> the error is not actually "No space left on device", but "Out of memory".
> 
> It is semantically correct to return -ENOMEM in all failed kstrndup()
> and kzalloc() cases in this driver, as it is not a problem with disk
> space, but with kernel memory allocator failing allocation.
> 
> The semantically correct should be:
> 
>         name = kstrndup(buf, count, GFP_KERNEL);
>         if (!name)
>                 return -ENOMEM;
> 
> Cc: Dan Carpenter <error27@...il.com>
> Cc: Takashi Iwai <tiwai@...e.de>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Luis R. Rodriguez <mcgrof@...nel.org>
> Cc: Brian Norris <computersforpeace@...il.com>
> Cc: stable@...r.kernel.org # 4.14
> Fixes: c92316bf8e948 ("test_firmware: add batched firmware tests")
> Fixes: 0a8adf584759c ("test: add firmware_class loader test")
> Fixes: eb910947c82f9 ("test: firmware_class: add asynchronous request trigger")
> Fixes: 061132d2b9c95 ("test_firmware: add test custom fallback trigger")
> Link: https://lore.kernel.org/all/20230606070808.9300-1-mirsad.todorovac@alu.unizg.hr/
> Signed-off-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> 
> [ This is the backport of the patch to 4.19 and 4.14 branches. There are no	]
> [ semantic differences in the commit. Backport is provided for completenes sake	]
> [ so it would apply to all of the supported LTS kernels				]

This commit is already in the 4.19.291 release, does it need to be
included in there again for some reason?

thanks,

greg k-h