X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibudev%2Flibudev-enumerate.c;fp=src%2Flibudev%2Flibudev-enumerate.c;h=385829d464345bf96705c358e9f26152f725f96d;hb=f9e84da678cc28998fb04bf5ba326d91fc2850fa;hp=b96e5b278fa0f13b84450042b15e7ad949c39035;hpb=c851f34ba1cb379d3b3fc06a8421051fd9d0394d;p=elogind.git

diff --git a/src/libudev/libudev-enumerate.c b/src/libudev/libudev-enumerate.c
index b96e5b278..385829d46 100644
--- a/src/libudev/libudev-enumerate.c
+++ b/src/libudev/libudev-enumerate.c
@@ -721,6 +721,8 @@ static bool match_subsystem(struct udev_enumerate *udev_enumerate, const char *s
 {
         struct udev_list_entry *list_entry;
 
+        subsystem = subsystem ? : "";
+
         udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_nomatch_list)) {
                 if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
                         return false;