linux-kernel - [PATCH] btrfs: Use kfree() in btrfs_ioctl_get_subvol

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Message-Id: <20200616153159.10691-1-longman@redhat.com>
Date:   Tue, 16 Jun 2020 11:31:59 -0400
From:   Waiman Long <longman@...hat.com>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Cc:     linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        Waiman Long <longman@...hat.com>
Subject: [PATCH] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info()

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.

Reported-by: David Sterba <dsterba@...e.cz>
Signed-off-by: Waiman Long <longman@...hat.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 168deb8ef68a..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);
-	kzfree(subvol_info);
+	kfree(subvol_info);
 	return ret;
 }
 
-- 
2.18.1