X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibudev%2Flibudev-enumerate.c;h=48ffe83d364359204fdb575714a45dd077a3410f;hp=2c1f7ab4ace4d3cfc7cf5618afef6bb340742f8b;hb=051dfe8708e394a64e8ef6c281228763481ad32c;hpb=d5a89d7dc17a5ba5cf4fc71f82963c5c94a31c3d

diff --git a/src/libudev/libudev-enumerate.c b/src/libudev/libudev-enumerate.c
index 2c1f7ab4a..48ffe83d3 100644
--- a/src/libudev/libudev-enumerate.c
+++ b/src/libudev/libudev-enumerate.c
@@ -122,7 +122,7 @@ _public_ struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_e
  * Drop a reference of an enumeration context. If the refcount reaches zero,
  * all resources of the enumeration context will be released.
  *
- * Returns: the passed enumeration context if it has still an active reference, or #NULL otherwise.
+ * Returns: #NULL
  **/
 _public_ struct udev_enumerate *udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
 {
@@ -132,7 +132,7 @@ _public_ struct udev_enumerate *udev_enumerate_unref(struct udev_enumerate *udev
                 return NULL;
         udev_enumerate->refcount--;
         if (udev_enumerate->refcount > 0)
-                return udev_enumerate;
+                return NULL;
         udev_list_cleanup(&udev_enumerate->sysattr_match_list);
         udev_list_cleanup(&udev_enumerate->sysattr_nomatch_list);
         udev_list_cleanup(&udev_enumerate->subsystem_match_list);
@@ -270,12 +270,13 @@ _public_ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enume
                 return NULL;
         if (!udev_enumerate->devices_uptodate) {
                 unsigned int i;
+                int move_later = -1;
                 unsigned int max;
-                struct syspath *prev = NULL, *move_later = NULL;
+                struct syspath *prev = NULL;
                 size_t move_later_prefix = 0;
 
                 udev_list_cleanup(&udev_enumerate->devices_list);
-                qsort(udev_enumerate->devices, udev_enumerate->devices_cur, sizeof(struct syspath), syspath_cmp);
+                qsort_safe(udev_enumerate->devices, udev_enumerate->devices_cur, sizeof(struct syspath), syspath_cmp);
 
                 max = udev_enumerate->devices_cur;
                 for (i = 0; i < max; i++) {
@@ -299,27 +300,29 @@ _public_ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enume
                         /* skip to be delayed devices, and move the to
                          * the point where the prefix changes. We can
                          * only move one item at a time. */
-                        if (!move_later) {
+                        if (move_later == -1) {
                                 move_later_prefix = devices_delay_later(udev_enumerate->udev, entry->syspath);
 
                                 if (move_later_prefix > 0) {
-                                        move_later = entry;
+                                        move_later = i;
                                         continue;
                                 }
                         }
 
-                        if (move_later &&
-                            strncmp(entry->syspath, move_later->syspath, move_later_prefix) != 0) {
+                        if ((move_later >= 0) &&
+                             !strneq(entry->syspath, udev_enumerate->devices[move_later].syspath, move_later_prefix)) {
 
-                                udev_list_entry_add(&udev_enumerate->devices_list, move_later->syspath, NULL);
-                                move_later = NULL;
+                                udev_list_entry_add(&udev_enumerate->devices_list,
+                                                    udev_enumerate->devices[move_later].syspath, NULL);
+                                move_later = -1;
                         }
 
                         udev_list_entry_add(&udev_enumerate->devices_list, entry->syspath, NULL);
                 }
 
-                if (move_later)
-                        udev_list_entry_add(&udev_enumerate->devices_list, move_later->syspath, NULL);
+                if (move_later >= 0)
+                        udev_list_entry_add(&udev_enumerate->devices_list,
+                                            udev_enumerate->devices[move_later].syspath, NULL);
 
                 /* add and cleanup delayed devices from end of list */
                 for (i = max; i < udev_enumerate->devices_cur; i++) {
@@ -718,10 +721,14 @@ static bool match_subsystem(struct udev_enumerate *udev_enumerate, const char *s
 {
         struct udev_list_entry *list_entry;
 
+        if (!subsystem)
+                return false;
+
         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;
         }
+
         if (udev_list_get_entry(&udev_enumerate->subsystem_match_list) != NULL) {
                 udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->subsystem_match_list)) {
                         if (fnmatch(udev_list_entry_get_name(list_entry), subsystem, 0) == 0)
@@ -729,6 +736,7 @@ static bool match_subsystem(struct udev_enumerate *udev_enumerate, const char *s
                 }
                 return false;
         }
+
         return true;
 }
 
@@ -826,23 +834,27 @@ nomatch:
 static int parent_add_child(struct udev_enumerate *enumerate, const char *path)
 {
         struct udev_device *dev;
+        int r = 0;
 
         dev = udev_device_new_from_syspath(enumerate->udev, path);
         if (dev == NULL)
                 return -ENODEV;
 
         if (!match_subsystem(enumerate, udev_device_get_subsystem(dev)))
-                return 0;
+                goto nomatch;
         if (!match_sysname(enumerate, udev_device_get_sysname(dev)))
-                return 0;
+                goto nomatch;
         if (!match_property(enumerate, dev))
-                return 0;
+                goto nomatch;
         if (!match_sysattr(enumerate, dev))
-                return 0;
+                goto nomatch;
 
         syspath_add(enumerate, udev_device_get_syspath(dev));
+        r = 1;
+
+nomatch:
         udev_device_unref(dev);
-        return 1;
+        return r;
 }
 
 static int parent_crawl_children(struct udev_enumerate *enumerate, const char *path, int maxdepth)