Re: [PATCH] cxl: Fix possible null pointer dereference in read_handle()

[Greg KH]

On Tue, Jul 09, 2024 at 09:17:54PM +0800, Ma Ke wrote:
> In read_handle() of_get_address() may return NULL which is later
> dereferenced. Fix this bug by adding NULL check.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
> Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
> ---
>  drivers/misc/cxl/of.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/cxl/of.c b/drivers/misc/cxl/of.c
> index bcc005dff1c0..d8dbb3723951 100644
> --- a/drivers/misc/cxl/of.c
> +++ b/drivers/misc/cxl/of.c
> @@ -58,7 +58,7 @@ static int read_handle(struct device_node *np, u64 *handle)
>  
>  	/* Get address and size of the node */
>  	prop = of_get_address(np, 0, &size, NULL);
> -	if (size)
> +	if (!prop || size)
>  		return -EINVAL;

How was this issue found?

thanks,

greg k-h