linux-kernel - Re: [PATCH v2] fs/btrfs: Fix uninitialized variable

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Message-ID: <20210420102214.GA1981@kadam>
Date:   Tue, 20 Apr 2021 13:22:14 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Khaled ROMDHANI <khaledromdhani216@...il.com>
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] fs/btrfs: Fix uninitialized variable

On Sat, Apr 17, 2021 at 04:36:16PM +0100, Khaled ROMDHANI wrote:
> As reported by the Coverity static analysis.
> The variable zone is not initialized which
> may causes a failed assertion.
> 
> Addresses-Coverity: ("Uninitialized variables")
> Signed-off-by: Khaled ROMDHANI <khaledromdhani216@...il.com>
> ---
> v2: add a default case as proposed by David Sterba
> ---
>  fs/btrfs/zoned.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
> index eeb3ebe11d7a..82527308d165 100644
> --- a/fs/btrfs/zoned.c
> +++ b/fs/btrfs/zoned.c
> @@ -143,6 +143,9 @@ static inline u32 sb_zone_number(int shift, int mirror)
>  	case 0: zone = 0; break;
>  	case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
>  	case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;

It took me a while to spot these break statements.

> +	default:
> +		zone = 0;
> +	break;

This break needs to be indented one more tab.

>  	}
>  
>  	ASSERT(zone <= U32_MAX);

regards,
dan carpenter