diff --git a/llvm/lib/MC/XCOFFObjectWriter.cpp b/llvm/lib/MC/XCOFFObjectWriter.cpp
--- a/llvm/lib/MC/XCOFFObjectWriter.cpp
+++ b/llvm/lib/MC/XCOFFObjectWriter.cpp
@@ -140,10 +140,11 @@
 
   Section(const char *N, XCOFF::SectionTypeFlags Flags, bool IsVirtual,
           CsectGroups Groups)
-      : Address(0), Size(0), FileOffsetToData(0), FileOffsetToRelocations(0),
-        RelocationCount(0), Flags(Flags), Index(UninitializedIndex),
-        IsVirtual(IsVirtual), Groups(Groups) {
-    strncpy(Name, N, XCOFF::NameSize);
+      : Name(), Address(0), Size(0), FileOffsetToData(0),
+        FileOffsetToRelocations(0), RelocationCount(0), Flags(Flags),
+        Index(UninitializedIndex), IsVirtual(IsVirtual), Groups(Groups) {
+    assert(strlen(N) <= XCOFF::NameSize && "section name too long");
+    memcpy(Name, N, strlen(N));
   }
 };