1 files changed, 26 insertions, 4 deletions

diff --git a/src/libsystemd/sd-bus/bus-internal.c b/src/libsystemd/sd-bus/bus-internal.c
index 91b288cd25..37793e48ed 100644
--- a/src/libsystemd/sd-bus/bus-internal.c
+++ b/src/libsystemd/sd-bus/bus-internal.c
@@ -211,6 +211,17 @@ bool member_name_is_valid(const char *p) {
         return true;
 }
 
+/*
+ * Complex pattern match
+ * This checks whether @a is a 'complex-prefix' of @b, or @b is a
+ * 'complex-prefix' of @a, based on strings that consist of labels with @c as
+ * spearator. This function returns true if:
+ *   - both strings are equal
+ *   - either is a prefix of the other and ends with @c
+ * The second rule makes sure that either string needs to be fully included in
+ * the other, and the string which is considered the prefix needs to end with a
+ * separator.
+ */
 static bool complex_pattern_check(char c, const char *a, const char *b) {
         bool separator = false;
 
@@ -222,9 +233,7 @@ static bool complex_pattern_check(char c, const char *a, const char *b) {
 
         for (;;) {
                 if (*a != *b)
-                        return (separator && (*a == 0 || *b == 0)) ||
-                                (*a == 0 && *b == c && b[1] == 0) ||
-                                (*b == 0 && *a == c && a[1] == 0);
+                        return (separator && (*a == 0 || *b == 0));
 
                 if (*a == 0)
                         return true;
@@ -243,7 +252,18 @@ bool path_complex_pattern(const char *pattern, const char *value) {
         return complex_pattern_check('/', pattern, value);
 }
 
+/*
+ * Simple pattern match
+ * This checks whether @a is a 'simple-prefix' of @b, based on strings that
+ * consist of labels with @c as separator. This function returns true, if:
+ *   - if @a and @b are equal
+ *   - if @a is a prefix of @b, and the first following character in @b (or the
+ *     last character in @a) is @c
+ * The second rule basically makes sure that if @a is a prefix of @b, then @b
+ * must follow with a new label separated by @c. It cannot extend the label.
+ */
 static bool simple_pattern_check(char c, const char *a, const char *b) {
+        bool separator = false;
 
         if (!a && !b)
                 return true;
@@ -253,11 +273,13 @@ static bool simple_pattern_check(char c, const char *a, const char *b) {
 
         for (;;) {
                 if (*a != *b)
-                        return *a == 0 && *b == c;
+                        return *a == 0 && (*b == c || separator);
 
                 if (*a == 0)
                         return true;
 
+                separator = *a == c;
+
                 a++, b++;
         }
 }