match_attr() - copy attr value only when needed

diff --git a/udev/udev-rules.c b/udev/udev-rules.c
index 44b26906b48465d8cfe3de3583d14933f8c59223..1647f5cb097aa2555b6fbf12778b9342811ab1a1 100644 (file)
--- a/udev/udev-rules.c
+++ b/udev/udev-rules.c
@@ -1791,15 +1791,18 @@ static int match_key(struct udev_rules *rules, struct token *token, const char *
 
 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
 {
-       char attr[UTIL_PATH_SIZE];
        const char *key_name = &rules->buf[cur->key.attr_off];
        const char *key_value = &rules->buf[cur->key.value_off];
        char value[UTIL_NAME_SIZE];
        size_t len;
 
-       util_strlcpy(attr, key_name, sizeof(attr));
-       util_strlcpy(value, "", sizeof(value));
-       util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
+       value[0] = '\0';
+       if (key_name[0] == '[') {
+               char attr[UTIL_PATH_SIZE];
+
+               util_strlcpy(attr, key_name, sizeof(attr));
+               util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
+       }
        if (value[0] == '\0') {
                const char *val;
 
@@ -1807,7 +1810,7 @@ static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct
                if (val != NULL)
                        util_strlcpy(value, val, sizeof(value));
        }
-       if (value[0]=='\0')
+       if (value[0] == '\0')
                return -1;
 
        /* strip trailing whitespace of value, if not asked to match for it */