linux-kernel - Re: [PATCH v2] bus: fsl-mc: Check return value of platform_get

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Message-ID: <31c6a5ad-08ac-46b2-9362-84484482bd06@csgroup.eu>
Date: Mon, 22 Sep 2025 16:57:09 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Salah Triki <salah.triki@...il.com>, Ioana Ciornei
 <ioana.ciornei@....com>, Markus Elfring <Markus.Elfring@....de>,
 linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] bus: fsl-mc: Check return value of
 platform_get_resource()



Le 25/08/2025 à 11:34, Salah Triki a écrit :
> [Vous ne recevez pas souvent de courriers de salah.triki@...il.com. D?couvrez pourquoi ceci est important ? https://aka.ms/LearnAboutSenderIdentification ]
> 
> platform_get_resource() returns NULL in case of failure, so check its
> return value and propagate the error in order to prevent NULL pointer
> dereference.
> 
> Fixes: 6305166c8771 ("bus: fsl-mc: Add ACPI support for fsl-mc")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Salah Triki <salah.triki@...il.com>
> ---
> Changes in v2:
>     - Add Fixes and Cc tags, as suggested by Markus Elfring and Christophe
>       Leroy.
>     - Remove blank line before the if statement, as suggested by Markus
>       Elfring.
>     - Replace ENODEV with EINVAL, as suggestd by Christophe Leroy.
> 
>   drivers/bus/fsl-mc/fsl-mc-bus.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index 7671bd158545..cd83cd564736 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -1105,6 +1105,9 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
>           * Get physical address of MC portal for the root DPRC:
>           */
>          plat_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!plat_res)
> +               return -EINVAL;
> +
>          mc_portal_phys_addr = plat_res->start;
>          mc_portal_size = resource_size(plat_res);
>          mc_portal_base_phys_addr = mc_portal_phys_addr & ~0x3ffffff;
> --
> 2.43.0
> 

Applied, thanks!

Christophe