dm ioctl: validate name length when renaming

When renaming a mapped device validate the length of the new name.

The rename ioctl accepted any correctly-terminated string enclosed
within the data passed from userspace.  The other ioctls enforce a
size limit of DM_NAME_LEN.  If the name is changed and becomes longer
than that, the device can no longer be addressed by name.

Fix it by properly checking for device name length (including
terminating zero).

Cc: stable@kernel.org
Signed-off-by: Milan Broz <mbroz@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
Reviewed-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 54d0588fc1f6..977f36612e83 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -704,7 +704,8 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
         char *new_name = (char *) param + param->data_start;
 
         if (new_name < param->data ||
-            invalid_str(new_name, (void *) param + param_size)) {
+            invalid_str(new_name, (void *) param + param_size) ||
+            strlen(new_name) > DM_NAME_LEN - 1) {
                 DMWARN("Invalid new logical volume name supplied.");
                 return -EINVAL;
         }