linux-kernel - Re: [PATCH] fs: btrfs: fix possible memory leaks in btrfs_get_dev_args_from

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Message-ID: <20220817144256.GE13489@twin.jikos.cz>
Date:   Wed, 17 Aug 2022 16:42:56 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Zixuan Fu <r33s3n6@...il.com>
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com, TOTE Robot <oslab@...nghua.edu.cn>
Subject: Re: [PATCH] fs: btrfs: fix possible memory leaks in
 btrfs_get_dev_args_from_path()

On Mon, Aug 15, 2022 at 11:16:06PM +0800, Zixuan Fu wrote:
> In btrfs_get_dev_args_from_path(), btrfs_get_bdev_and_sb() can fail if the
> path is invalid. In this case, btrfs_get_dev_args_from_path() returns
> directly without freeing args->uuid and args->fsid allocated before, which
> causes memory leaks.
> 
> To fix these possible leaks, when btrfs_get_bdev_and_sb() fails, 
> btrfs_put_dev_args_from_path() is called to clean up the memory.
> 
> Fixes: faa775c41d655 ("btrfs: add a btrfs_get_dev_args_from_path helper")
> Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
> Signed-off-by: Zixuan Fu <r33s3n6@...il.com>

Added to misc-next, thanks.