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authorMikulas Patocka <mpatocka@redhat.com>2011-08-02 13:32:06 +0200
committerAlasdair G Kergon <agk@redhat.com>2011-08-02 13:32:06 +0200
commit759dea204cce9f1fc2a5d00ea25211299fc7a4a0 (patch)
tree3ddbfdc0c4cb97317ea0d0d7bb6879fcac72b840 /drivers/md/dm-ioctl.c
parentdm ioctl: introduce __get_dev_cell (diff)
downloadlinux-759dea204cce9f1fc2a5d00ea25211299fc7a4a0.tar.xz
linux-759dea204cce9f1fc2a5d00ea25211299fc7a4a0.zip
dm ioctl: forbid multiple device specifiers
Exactly one of name, uuid or device must be specified when referencing an existing device. This removes the ambiguity (risking the wrong device being updated) if two conflicting parameters were specified. Previously one parameter got used and any others were ignored silently. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to '')
-rw-r--r--drivers/md/dm-ioctl.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4c350914f4a0..2e9a3ca37bdd 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -739,10 +739,16 @@ static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
struct hash_cell *hc = NULL;
if (*param->uuid) {
+ if (*param->name || param->dev)
+ return NULL;
+
hc = __get_uuid_cell(param->uuid);
if (!hc)
return NULL;
} else if (*param->name) {
+ if (param->dev)
+ return NULL;
+
hc = __get_name_cell(param->name);
if (!hc)
return NULL;