Messages in this thread | | | Subject | Re: [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info() | From | Waiman Long <> | Date | Tue, 16 Jun 2020 11:05:22 -0400 |
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On 6/16/20 10:48 AM, David Sterba wrote: > 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. > Sure, I will move it forward in the patch series.
Thanks, Longman
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