[PATCH] D20768: [MC] Return early when .fill size is negative

[Petr Hosek via llvm-commits]

phosek created this revision.
phosek added a reviewer: rafael.
phosek added subscribers: rafael, phosek, llvm-commits.
phosek set the repository for this revision to rL LLVM.

Rather than invoking emitFill with negative size, which may trigger
an undefined behavior, return immediately after emitting the warning.

Repository:
  rL LLVM

http://reviews.llvm.org/D20768

Files:
  lib/MC/MCParser/AsmParser.cpp

Index: lib/MC/MCParser/AsmParser.cpp
===================================================================
--- lib/MC/MCParser/AsmParser.cpp
+++ lib/MC/MCParser/AsmParser.cpp
@@ -2801,7 +2801,7 @@
 
   if (FillSize < 0) {
     Warning(SizeLoc, "'.fill' directive with negative size has no effect");
-    NumValues = MCConstantExpr::create(0, getStreamer().getContext());
+    return false;
   }
   if (FillSize > 8) {
     Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");


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