linux-kernel - Re: [PATCH] mtd: rawnand: meson: initialize struct with zeroes

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Date:   Thu, 16 Feb 2023 21:09:34 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     Краснов Арсений 
        <AVKrasnov@...rdevices.ru>
CC:     Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Krasnov Arseniy <oxffffaa@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH] mtd: rawnand: meson: initialize struct with zeroes

On Thu, Feb 16, 2023 at 08:57:32PM +0300, Краснов Арсений wrote:
> This structure must be zeroed, because it's field 'hw->core' is used as
> 'parent' in 'clk_core_fill_parent_index()', but it will be uninitialized.
> The following backtrace is result of the dereference of such pointer:
> 
> [    1.081319]  __clk_register+0x414/0x820
> [    1.085113]  devm_clk_register+0x64/0xd0
> [    1.088995]  meson_nfc_probe+0x258/0x6ec
> [    1.092875]  platform_probe+0x70/0xf0
> [    1.096498]  really_probe+0xc8/0x3e0
> [    1.100034]  __driver_probe_device+0x84/0x190
> [    1.104346]  driver_probe_device+0x44/0x120
> [    1.108487]  __driver_attach+0xb4/0x220
> [    1.112282]  bus_for_each_dev+0x78/0xd0
> [    1.116077]  driver_attach+0x2c/0x40
> [    1.119613]  bus_add_driver+0x184/0x240
> [    1.123408]  driver_register+0x80/0x140
> [    1.127203]  __platform_driver_register+0x30/0x40
> [    1.131860]  meson_nfc_driver_init+0x24/0x30

I suppose it would be better to have 'fixes' tag here, like:

Fixes: 1e4d3ba66888 ("mtd: rawnand: meson: fix the clock")

> 
> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
> ---
>  drivers/mtd/nand/raw/meson_nand.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index 5ee01231ac4c..30e326adabfc 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -991,7 +991,7 @@ static const struct mtd_ooblayout_ops meson_ooblayout_ops = {
>  
>  static int meson_nfc_clk_init(struct meson_nfc *nfc)
>  {
> -	struct clk_parent_data nfc_divider_parent_data[1];
> +	struct clk_parent_data nfc_divider_parent_data[1] = {0};
>  	struct clk_init_data init = {0};
>  	int ret;

-- 
Thank you,
Dmitry