linux-kernel - Re: [PATCH AUTOSEL 5.7 11/53] btrfs: use kfree() in btrfs_ioctl_get_subvol

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Date:   Thu, 9 Jul 2020 18:28:15 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     dsterba@...e.cz, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Waiman Long <longman@...hat.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.7 11/53] btrfs: use kfree() in
 btrfs_ioctl_get_subvol_info()

On Thu, Jul 02, 2020 at 10:25:58AM +0200, David Sterba wrote:
>On Wed, Jul 01, 2020 at 09:21:20PM -0400, Sasha Levin wrote:
>> From: Waiman Long <longman@...hat.com>
>>
>> [ Upstream commit b091f7fede97cc64f7aaad3eeb37965aebee3082 ]
>>
>> In btrfs_ioctl_get_subvol_info(), there is a classic case where kzalloc()
>> was incorrectly paired with kzfree(). According to David Sterba, there
>> isn't any sensitive information in the subvol_info that needs to be
>> cleared before freeing. So kzfree() isn't really needed, use kfree()
>> instead.
>
>I don't think this patch is necessary for any stable tree, it's meant
>only to ease merging a tree-wide patchset to rename kzfree.  In btrfs
>code there was no point using it so it's plain kfree.

I've dropped it, thanks!

-- 
Thanks,
Sasha