linux-kernel - Re: [PATCH] btrfs: initialize variable cancel

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Date:   Fri, 21 Jan 2022 15:40:49 +0000
From:   Filipe Manana <fdmanana@...nel.org>
To:     trix@...hat.com
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        nathan@...nel.org, ndesaulniers@...gle.com, anand.jain@...cle.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] btrfs: initialize variable cancel

On Fri, Jan 21, 2022 at 05:45:22AM -0800, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Clang static analysis reports this problem
> ioctl.c:3333:8: warning: 3rd function call argument is an
>   uninitialized value
>     ret = exclop_start_or_cancel_reloc(fs_info,
> 
> cancel is only set in one branch of an if-check and is
> always used.  So initialize to false.
> 
> Fixes: 1a15eb724aae ("btrfs: use btrfs_get_dev_args_from_path in dev removal ioctls")
> Signed-off-by: Tom Rix <trix@...hat.com>

Reviewed-by: Filipe Manana <fdmanana@...e.com>

Could use a more precise subject like for example:

  "btrfs: fix use of uninitialized variable at rm device ioctl"

Anyway, it looks good.
Thanks.

> ---
>  fs/btrfs/ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 190ad8af4f45a..26e82379747f8 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3308,7 +3308,7 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
>  	struct block_device *bdev = NULL;
>  	fmode_t mode;
>  	int ret;
> -	bool cancel;
> +	bool cancel = false;
>  
>  	if (!capable(CAP_SYS_ADMIN))
>  		return -EPERM;
> -- 
> 2.26.3
>