linux-kernel - RE: [PATCH] EDAC/versal: Fix possible null pointer dereference in emif_get

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Message-ID:
 <BY5PR12MB49020D6019CE24F863A5B6AD81DB2@BY5PR12MB4902.namprd12.prod.outlook.com>
Date: Tue, 9 Jul 2024 15:00:48 +0000
From: "Datta, Shubhrajyoti" <shubhrajyoti.datta@....com>
To: Ma Ke <make24@...as.ac.cn>, "Potthuri, Sai Krishna"
	<sai.krishna.potthuri@....com>, "bp@...en8.de" <bp@...en8.de>,
	"tony.luck@...el.com" <tony.luck@...el.com>, "james.morse@....com"
	<james.morse@....com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	"rric@...nel.org" <rric@...nel.org>
CC: "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] EDAC/versal: Fix possible null pointer dereference in
 emif_get_id()

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Ma Ke <make24@...as.ac.cn>
> Sent: Tuesday, July 9, 2024 7:29 PM
> To: Datta, Shubhrajyoti <shubhrajyoti.datta@....com>; Potthuri, Sai
> Krishna <sai.krishna.potthuri@....com>; bp@...en8.de;
> tony.luck@...el.com; james.morse@....com; mchehab@...nel.org;
> rric@...nel.org
> Cc: linux-edac@...r.kernel.org; linux-kernel@...r.kernel.org; Ma Ke
> <make24@...as.ac.cn>
> Subject: [PATCH] EDAC/versal: Fix possible null pointer dereference in
> emif_get_id()
>
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> In emif_get_id(), of_get_address() may return NULL which is later
> dereferenced. Fix this bug by adding NULL check.
>
> Fixes: 6f15b178cd63 ("EDAC/versal: Add a Xilinx Versal memory controller
> driver")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
>  drivers/edac/versal_edac.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/edac/versal_edac.c b/drivers/edac/versal_edac.c index
> a556d23e8261..6ab87277d439 100644
> --- a/drivers/edac/versal_edac.c
> +++ b/drivers/edac/versal_edac.c
> @@ -1053,6 +1053,9 @@ static u32 emif_get_id(struct device_node *node)
>         const __be32 *addrp;
>
>         addrp = of_get_address(node, 0, NULL, NULL);
> +       if (!addrp)
> +               return -EINVAL;
> +
>         my_addr = (u32)of_translate_address(node, addrp);
>
>         for_each_matching_node(np, xlnx_edac_match) { @@ -1060,6 +1063,9
> @@ static u32 emif_get_id(struct device_node *node)
>                         continue;
>
>                 addrp = of_get_address(np, 0, NULL, NULL);
> +               if (!addrp)
> +                       return _EINVAL;
Please fix the typo.
> +
>                 addr = (u32)of_translate_address(np, addrp);
>
>                 edac_printk(KERN_INFO, EDAC_MC,
> --
> 2.25.1