From 23d39f63aa87e812fd879b8bc32ee6ccfe733de3 Mon Sep 17 00:00:00 2001 From: Milan Broz <mbroz@redhat.com> Date: Tue, 6 Jan 2009 03:05:04 +0000 Subject: [PATCH] dm ioctl: allow dm_copy_name_and_uuid to return only one field Allow NULL buffer in dm_copy_name_and_uuid if you only want to return one of the fields. (Required by a following patch that adds these fields to sysfs.) Signed-off-by: Milan Broz <mbroz@redhat.com> Reviewed-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> --- drivers/md/dm-ioctl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 777c948180f9..8da7a017b4ef 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1550,8 +1550,10 @@ int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) goto out; } - strcpy(name, hc->name); - strcpy(uuid, hc->uuid ? : ""); + if (name) + strcpy(name, hc->name); + if (uuid) + strcpy(uuid, hc->uuid ? : ""); out: up_read(&_hash_lock); -- GitLab