Calling 'DM_DEVICE_INFO' might succeed but the returned context might refer to an invalid device. So one needs to check the 'exists' field to avoid this. Signed-off-by: Hannes Reinecke <hare@xxxxxxx> --- libmultipath/devmapper.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c index 5e68aeb..1901052 100644 --- a/libmultipath/devmapper.c +++ b/libmultipath/devmapper.c @@ -615,6 +615,9 @@ dm_get_opencount (const char * mapname) if (!dm_task_get_info(dmt, &info)) goto out; + if (!info.exists) + goto out; + r = info.open_count; out: dm_task_destroy(dmt); @@ -640,6 +643,9 @@ dm_get_major (char * mapname) if (!dm_task_get_info(dmt, &info)) goto out; + if (!info.exists) + goto out; + r = info.major; out: dm_task_destroy(dmt); @@ -665,6 +671,9 @@ dm_get_minor (char * mapname) if (!dm_task_get_info(dmt, &info)) goto out; + if (!info.exists) + goto out; + r = info.minor; out: dm_task_destroy(dmt); -- 1.8.4.5 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
