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From: David Sterba <dsterba@suse.cz>
To: Waiman Long <longman@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Joe Perches <joe@perches.com>,
	Matthew Wilcox <willy@infradead.org>,
	David Rientjes <rientjes@google.com>,
	Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	David Sterba <dsterba@suse.cz>,
	"Jason A . Donenfeld" <Jason@zx2c4.com>,
	linux-mm@kvack.org, keyrings@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
	linux-pm@vger.kernel.org,
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	linux-integrity@vger.kernel.org
Subject: Re: [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info()
Date: Tue, 16 Jun 2020 16:48:04 +0200
Message-ID: <20200616144804.GD27795@twin.jikos.cz> (raw)
In-Reply-To: <20200616015718.7812-4-longman@redhat.com>

On Mon, Jun 15, 2020 at 09:57:18PM -0400, Waiman Long wrote:
> 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 kfree_sensitive() isn't really needed,
> use kfree() instead.
> 
> Reported-by: David Sterba <dsterba@suse.cz>
> Signed-off-by: Waiman Long <longman@redhat.com>
> ---
>  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 f1dd9e4271e9..e8f7c5f00894 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -2692,7 +2692,7 @@ static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
>  	btrfs_put_root(root);
>  out_free:
>  	btrfs_free_path(path);
> -	kfree_sensitive(subvol_info);
> +	kfree(subvol_info);

I would rather merge a patch doing to kzfree -> kfree instead of doing
the middle step to switch it to kfree_sensitive. If it would help
integration of your patchset I can push it to the next rc so there are
no kzfree left in the btrfs code. Treewide change like that can take
time so it would be one less problem to care about for you.

  reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16  1:57 [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-06-16  1:57 ` [PATCH v4 1/3] mm/slab: Use memzero_explicit() in kzfree() Waiman Long
2020-06-16  3:30   ` Eric Biggers
2020-06-16 13:05     ` Waiman Long
2020-06-16 15:46     ` David Howells
2020-06-16  6:42   ` Michal Hocko
2020-06-16  9:08     ` Dan Carpenter
2020-06-16  1:57 ` [PATCH v4 2/3] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-06-16 14:26   ` Dan Carpenter
2020-06-16 15:05     ` Waiman Long
2020-06-16  1:57 ` [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info() Waiman Long
2020-06-16 14:48   ` David Sterba [this message]
2020-06-16 15:05     ` Waiman Long
2020-06-16 18:53 ` [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() Joe Perches
2020-06-16 19:43   ` Waiman Long
2020-06-16 19:46   ` Jason A. Donenfeld
2020-06-16 20:01   ` Waiman Long
2020-06-16 21:14   ` Matthew Wilcox
2020-06-16 23:01   ` David Sterba
2020-06-17  0:37     ` Matthew Wilcox
2020-06-17  7:12       ` Michal Hocko
2020-06-17 11:08         ` Matthew Wilcox
2020-06-17 11:31           ` Michal Hocko
2020-06-17 12:23             ` Matthew Wilcox
2020-06-17 12:55               ` Michal Hocko
2020-06-17  8:03       ` Jo -l
2020-06-17 21:31   ` Denis Efremov
2020-06-17 23:12     ` Joe Perches

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