linux-kernel - Re: [PATCH] ep93xx: clock: Fix UAF in mach-ep93xx/clock.c

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Date:   Wed, 27 Apr 2022 06:19:50 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Wan Jiabing <wanjiabing@...o.com>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Russell King <linux@...linux.org.uk>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH] ep93xx: clock: Fix UAF in mach-ep93xx/clock.c

Thank you, Wan!

On Wed, 2022-04-27 at 10:21 +0800, Wan Jiabing wrote:
> Fix following coccicheck errors:
> ./arch/arm/mach-ep93xx/clock.c:351:9-12: ERROR: reference preceded by free on line 349
> ./arch/arm/mach-ep93xx/clock.c:458:9-12: ERROR: reference preceded by free on line 456
> 
> Fix two more potential UAF errors.
> 
> Link: https://lore.kernel.org/all/20220418121212.634259061@linuxfoundation.org/
> Fixes: 9645ccc7bd7a ("ep93xx: clock: convert in-place to COMMON_CLK")
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>

Acked-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> ---
>  arch/arm/mach-ep93xx/clock.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
> index 4fa6ea5461b7..35f3734e512c 100644
> --- a/arch/arm/mach-ep93xx/clock.c
> +++ b/arch/arm/mach-ep93xx/clock.c
> @@ -345,8 +345,10 @@ static struct clk_hw *clk_hw_register_ddiv(const char *name,
>         psc->hw.init = &init;
>  
>         clk = clk_register(NULL, &psc->hw);
> -       if (IS_ERR(clk))
> +       if (IS_ERR(clk)) {
>                 kfree(psc);
> +               return ERR_CAST(clk);
> +       }
>  
>         return &psc->hw;
>  }
> @@ -452,8 +454,10 @@ static struct clk_hw *clk_hw_register_div(const char *name,
>         psc->hw.init = &init;
>  
>         clk = clk_register(NULL, &psc->hw);
> -       if (IS_ERR(clk))
> +       if (IS_ERR(clk)) {
>                 kfree(psc);
> +               return ERR_CAST(clk);
> +       }
>  
>         return &psc->hw;
>  }

-- 
Alexander Sverdlin.