linux-kernel - Re: [PATCH] btrfs: Fix a memory leak in btrfs_ioctl

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Date:   Thu, 21 Apr 2022 18:01:44 +0800
From:   Qu Wenruo <quwenruo.btrfs@....com>
To:     Haowen Bai <baihaowen@...zu.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: Fix a memory leak in btrfs_ioctl_balance()



On 2022/4/21 17:51, Haowen Bai wrote:
> Free "bargs" before return.
>
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>
> ---
>   fs/btrfs/ioctl.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index f08233c2b0b2..d4c8bea914b7 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -4389,13 +4389,13 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
>   			/* this is (2) */
>   			mutex_unlock(&fs_info->balance_mutex);
>   			ret = -EINPROGRESS;
> -			goto out;
> +			goto out_bargs;
>   		}
>   	} else {
>   		/* this is (1) */
>   		mutex_unlock(&fs_info->balance_mutex);
>   		ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
> -		goto out;
> +		goto out_bargs;

out_bargs will also unlock balance mutex, causing a double unlock.


>   	}
>
>   locked: