linux-kernel - Re: [PATCH] clk: stm32f4: avoid uninitialized variable access

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Message-ID: <a3c0ae24-0289-b008-ebdb-9c9ea289fec3@st.com>
Date:   Wed, 11 Jan 2017 17:08:55 +0100
From:   Gabriel Fernandez <gabriel.fernandez@...com>
To:     Arnd Bergmann <arnd@...db.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Rob Herring <robh@...nel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: stm32f4: avoid uninitialized variable access

On 01/11/2017 02:40 PM, Arnd Bergmann wrote:
> The failure path in the newly added function tries to free an
> uninitialized pointer:
>
> drivers/clk/clk-stm32f4.c: In function 'stm32f4_rcc_init':
> drivers/clk/clk-stm32f4.c:1106:4: error: 'gate' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> I'm adding an initialization to NULL here to make the kfree()
> succeed, and I'm also rearranging the cleanup so that the
> same kfree() is used for any error path, making the function
> slightly more robust against newly introduced bugs in the
> error handling.
>
> Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/clk/clk-stm32f4.c | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)
>
>
Acked-by: Gabriel Fernandez <gabriel.fernandez@...com>