linux-kernel - Re: drivers/of/dynamic.c:935 of_changeset_action() warn: possible memory leak of 'ce'

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Message-ID: <CAMuHMdUgTKfk0DdzS1ZtKuij1NE-nTEBdgnnS0o2uy8RbtagmQ@mail.gmail.com>
Date:   Thu, 7 Sep 2023 13:30:09 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Dan Carpenter <dan.carpenter@...aro.org>
Cc:     oe-kbuild@...ts.linux.dev, Rob Herring <robh@...nel.org>,
        lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: drivers/of/dynamic.c:935 of_changeset_action() warn: possible
 memory leak of 'ce'

Hi Dan,

On Thu, Sep 7, 2023 at 12:52 PM Dan Carpenter <dan.carpenter@...aro.org> wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   99d99825fc075fd24b60cc9cf0fb1e20b9c16b0f
> commit: 914d9d831e6126a6e7a92e27fcfaa250671be42c of: dynamic: Refactor action prints to not use "%pOF" inside devtree_lock
> config: x86_64-randconfig-161-20230831 (https://download.01.org/0day-ci/archive/20230901/202309011059.EOdr4im9-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
> reproduce: (https://download.01.org/0day-ci/archive/20230901/202309011059.EOdr4im9-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> | Closes: https://lore.kernel.org/r/202309011059.EOdr4im9-lkp@intel.com/
>
> smatch warnings:
> drivers/of/dynamic.c:935 of_changeset_action() warn: possible memory leak of 'ce'
>
> vim +/ce +935 drivers/of/dynamic.c
>
> 201c910bd6898d Pantelis Antoniou 2014-07-04  925  int of_changeset_action(struct of_changeset *ocs, unsigned long action,
> 201c910bd6898d Pantelis Antoniou 2014-07-04  926                struct device_node *np, struct property *prop)
> 201c910bd6898d Pantelis Antoniou 2014-07-04  927  {
> 201c910bd6898d Pantelis Antoniou 2014-07-04  928        struct of_changeset_entry *ce;
> 201c910bd6898d Pantelis Antoniou 2014-07-04  929
> 201c910bd6898d Pantelis Antoniou 2014-07-04  930        ce = kzalloc(sizeof(*ce), GFP_KERNEL);
> 606ad42aa3b1fe Rob Herring       2016-06-15  931        if (!ce)
> 201c910bd6898d Pantelis Antoniou 2014-07-04  932                return -ENOMEM;
> 606ad42aa3b1fe Rob Herring       2016-06-15  933
> 914d9d831e6126 Rob Herring       2023-08-18  934        if (WARN_ON(action >= ARRAY_SIZE(action_names)))
> 914d9d831e6126 Rob Herring       2023-08-18 @935                return -EINVAL;
>
> No kfree(ce).  Probably we move this check before the kmalloc()?

Yes, moving up sounds great.
Care to send a patch?

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds