Noissue - Avoid redundant lookup of whitelist CSP filter

lib/csp.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 32 matching lines @@
 
     if (checkWhitelisted(page, frame))
       return;
 
     // To avoid an extra matchesAny for the common case we assumed no
     // $genericblock filters applied when searching for a matching $csp filter.
     // We must now pay the price by first checking for a $genericblock filter
     // and if necessary that our $csp filter is specific.
     let specificOnly = !!checkWhitelisted(page, frame, null,
                                           typeMap.GENERICBLOCK);
-    if (specificOnly)
+    if (specificOnly && !(cspMatch instanceof WhitelistFilter))
     {
       cspMatch = defaultMatcher.matchesAny(details.url, typeMap.CSP, hostname,
                                            thirdParty, null, specificOnly);
       if (!cspMatch)
         return;
     }
 
     logRequest([details.tabId], {
       url: details.url, type: "CSP", docDomain: hostname,
       thirdParty, specificOnly
     }, cspMatch);
     filterNotifier.emit("filter.hitCount", cspMatch, 0, 0, [details.tabId]);
 
     if (cspMatch instanceof WhitelistFilter)
       return;
 
     details.responseHeaders.push({
       name: "Content-Security-Policy",
       value: cspMatch.csp
     });
 
     return {responseHeaders: details.responseHeaders};
   }
 }, {
   urls: ["http://*/*", "https://*/*"],
   types: ["main_frame", "sub_frame"]
 }, ["blocking", "responseHeaders"]);