linux-kernel - Re: [PATCH v2 RESEND] EDAC/ti: Fix possible null pointer dereference in _emif_get

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Message-ID: <2024072407-census-mahogany-5831@gregkh>
Date: Wed, 24 Jul 2024 15:31:21 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Ma Ke <make24@...as.ac.cn>
Cc: kristo@...nel.org, bp@...en8.de, tony.luck@...el.com,
	james.morse@....com, mchehab@...nel.org, rric@...nel.org,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2 RESEND] EDAC/ti: Fix possible null pointer dereference
 in _emif_get_id()

On Wed, Jul 24, 2024 at 03:10:42PM +0800, Ma Ke wrote:
> In _emif_get_id(), of_get_address() may return NULL which is later
> dereferenced. Fix this bug by adding NULL check.
> 
> Cc: stable@...r.kernel.org
> Fixes: 86a18ee21e5e ("EDAC, ti: Add support for TI keystone and DRA7xx EDAC")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
> Changes in v2:
> - added Cc stable line.
> ---
>  drivers/edac/ti_edac.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/edac/ti_edac.c b/drivers/edac/ti_edac.c
> index 29723c9592f7..db23887b2d81 100644
> --- a/drivers/edac/ti_edac.c
> +++ b/drivers/edac/ti_edac.c
> @@ -207,6 +207,9 @@ static int _emif_get_id(struct device_node *node)
>  	int my_id = 0;
>  
>  	addrp = of_get_address(node, 0, NULL, NULL);
> +	if (!addrp)
> +		return -EINVAL;
> +

How was this found?

How was this tested?

thanks,

greg k-h