[PATCH] don't segfault on a device-mapper device with no target

[Jim Meyering]

* libparted/arch/linux.c (_dm_maptype): Don't dereference NULL
for a device-mapper device with no target.  Use the string
"NO-TARGET" instead.  Reported by Mike Hwang in
http://thread.gmane.org/gmane.comp.gnu.parted.devel/2432
---
 libparted/arch/linux.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
index da812d5..4a8c9e7 100644
--- a/libparted/arch/linux.c
+++ b/libparted/arch/linux.c
@@ -348,7 +348,7 @@ _dm_maptype (PedDevice *dev)
         next = dm_get_next_target(dmt, NULL, &start, &length,
                                   &target_type, &params);

-        arch_specific->dmtype = strdup(target_type);
+        arch_specific->dmtype = strdup(target_type ? target_type : "NO-TARGET");
         if (arch_specific->dmtype == NULL)
                 goto bad;
         r = 0;
--
1.6.2.rc0.226.gf08f