linux-kernel - Re: [PATCH v2 iwl-next] ice: Fix some null pointer dereference issues in ice

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Message-ID: <1abd6bcb-6f6c-10a7-9b6f-e5e038233af8@intel.com>
Date:   Wed, 13 Dec 2023 10:49:10 +0100
From:   Przemek Kitszel <przemyslaw.kitszel@...el.com>
To:     Kunwu Chan <chentao@...inos.cn>, <jesse.brandeburg@...el.com>,
        <anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <richardcochran@...il.com>, <jacob.e.keller@...el.com>
CC:     <karol.kolacinski@...el.com>, <michal.michalik@...el.com>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Kunwu Chan <kunwu.chan@...mail.com>
Subject: Re: [PATCH v2 iwl-next] ice: Fix some null pointer dereference issues
 in ice_ptp.c

On 12/12/23 03:40, Kunwu Chan wrote:
> devm_kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure.
> 
> Fixes: d938a8cca88a ("ice: Auxbus devices & driver for E822 TS")
> Cc: Kunwu Chan <kunwu.chan@...mail.com>
> Suggested-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

You found the bug (or some some static analysis tool in that case);
there is no need to add Suggested-by for every person that suggests
something during review - the tag is for "person/s that suggested
making such change in the repo".

Subject line would be better if less generic, eg:
ice: avoid null deref of ptp auxbus name

> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
> ---
>   drivers/net/ethernet/intel/ice/ice_ptp.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index e9e59f4b5580..848e3e063e64 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -2743,6 +2743,8 @@ static int ice_ptp_register_auxbus_driver(struct ice_pf *pf)
>   	name = devm_kasprintf(dev, GFP_KERNEL, "ptp_aux_dev_%u_%u_clk%u",
>   			      pf->pdev->bus->number, PCI_SLOT(pf->pdev->devfn),
>   			      ice_get_ptp_src_clock_index(&pf->hw));
> +	if (!name)
> +		return -ENOMEM;
>   
>   	aux_driver->name = name;
>   	aux_driver->shutdown = ice_ptp_auxbus_shutdown;
> @@ -2989,6 +2991,8 @@ static int ice_ptp_create_auxbus_device(struct ice_pf *pf)
>   	name = devm_kasprintf(dev, GFP_KERNEL, "ptp_aux_dev_%u_%u_clk%u",
>   			      pf->pdev->bus->number, PCI_SLOT(pf->pdev->devfn),
>   			      ice_get_ptp_src_clock_index(&pf->hw));
> +	if (!name)
> +		return -ENOMEM;
>   
>   	aux_dev->name = name;
>   	aux_dev->id = id;

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

Regarding iwl-next vs iwl-net: this bug is really unlikely to manifest,
as we take care of both earlier and future mem allocs for ptp auxbus,
and auxiliary_device_init() checks for null name, so no big deal,
so: -next is fine