linux-kernel - Re: [PATCH v2] selftests/capabilities: Fix possible file leak in copy_fromat

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Date: Thu, 27 Jun 2024 08:50:40 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Ma Ke <make24@...as.ac.cn>, linux-kselftest@...r.kernel.org,
 Amer Al Shanawany <amer.shanawany@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski
 <luto@...nel.org>, Kees Cook <kees@...nel.org>,
 Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Shuah Khan <shuah@...nel.org>,
 Swarup Laxman Kotiaklapudi <swarupkotikalapudi@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] selftests/capabilities: Fix possible file leak in
 copy_fromat_to

>                                        … openat() and open() initialize
> 'from' and 'to', and only 'from' validated with 'if' statement.

Why do you find such information helpful?

>                                                                 If the
> initialization of variable 'to' fails,

The variable assignment will usually succeed.
A stored return value would eventually indicate a failed function call.

>                                        we should better check the value
> of 'to' and close 'from' to avoid possible file leak. Improve the checking
> of 'from' additionally.

Please split desired changes into separate update steps.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.10-rc5#n168

How do you think about to use a summary phrase like “Complete error handling
in copy_fromat_to()”?

…
> ---
> Changes in v2:
> - modified the patch according to suggestions;
> - found by customized static analysis tool.
> ---

* Would you like to replace a duplicate marker line by a blank line?

* I would appreciate further information about the applied tool.

Regards,
Markus