linux-kernel - Re: [PATCH][V2] MIPS: generic/yamon-dt: fix uninitialized variable error

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Date:   Tue, 16 Nov 2021 09:45:46 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Colin Ian King <colin.i.king@...glemail.com>
Cc:     Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] MIPS: generic/yamon-dt: fix uninitialized variable
 error

On Wed, Nov 10, 2021 at 11:28:24PM +0000, Colin Ian King wrote:
> In the case where fw_getenv returns an error when fetching values
> for ememsizea and memsize then variable phys_memsize is not assigned
> a variable and will be uninitialized on a zero check of phys_memsize.
> Fix this by initializing phys_memsize to zero.
> 
> Cleans up cppcheck error:
> arch/mips/generic/yamon-dt.c:100:7: error: Uninitialized variable: phys_memsize [uninitvar]
> 
> Fixes: f41d2430bbd6 ("MIPS: generic/yamon-dt: Support > 256MB of RAM")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
> V2: Use correct email address in SoB.
> ---
>  arch/mips/generic/yamon-dt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/mips/generic/yamon-dt.c b/arch/mips/generic/yamon-dt.c
> index a3aa22c77cad..a07a5edbcda7 100644
> --- a/arch/mips/generic/yamon-dt.c
> +++ b/arch/mips/generic/yamon-dt.c
> @@ -75,7 +75,7 @@ static unsigned int __init gen_fdt_mem_array(
>  __init int yamon_dt_append_memory(void *fdt,
>  				  const struct yamon_mem_region *regions)
>  {
> -	unsigned long phys_memsize, memsize;
> +	unsigned long phys_memsize = 0, memsize;
>  	__be32 mem_array[2 * MAX_MEM_ARRAY_ENTRIES];
>  	unsigned int mem_entries;
>  	int i, err, mem_off;
> -- 
> 2.32.0

applied to mips-fixes.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]