[WFS provider] Fix crash when calling setSubsetString() with a SQL that modifies the fields while a download is in progress

rouault · rouault · commit fa74b04ee963 · 2016-06-07T16:22:47.000+02:00
diff --git a/src/providers/wfs/qgswfsprovider.cpp b/src/providers/wfs/qgswfsprovider.cpp
@@ -656,6 +656,11 @@ QString QgsWFSProvider::subsetString()
 bool QgsWFSProvider::setSubsetString( const QString& theSQL, bool updateFeatureCount )
 {
   QgsDebugMsg( QString( "theSql = '%1'" ).arg( theSQL ) );
+
+  // Invalid and cancel current download before altering fields, etc...
+  // (crashes might happen if not done at the beginning)
+  mShared->invalidateCache();
+
   mSubsetString = theSQL;
   mCacheMinMaxDirty = true;
 
