safety checks to prevent dereferencing null

1999-06-19 21:18:13 +00:00
parent 58d7d53759
commit ae6cfe61f5
12 changed files with 33 additions and 3 deletions
--- a/layout/style/nsHTMLStyleSheet.cpp
+++ b/layout/style/nsHTMLStyleSheet.cpp
@@ -553,6 +553,8 @@ PRInt32 HTMLStyleSheetImpl::RulesMatching(nsIPresContext* aPresContext,

  PRInt32 matchCount = 0;

+  if (!aPresContext || !aContent || !aResults) return matchCount;
+
  nsIStyledContent* styledContent;
  if (NS_SUCCEEDED(aContent->QueryInterface(nsIStyledContent::GetIID(), (void**)&styledContent))) {
    PRInt32 nameSpace;