[PATCH] D50966: Fix an undefined behavior when storing an empty StringRef.

[Haojian Wu via Phabricator via cfe-commits]

hokein updated this revision to Diff 161467.
hokein added a comment.

Correct the fix.


Repository:
  rL LLVM

https://reviews.llvm.org/D50966

Files:
  lib/Support/StringSaver.cpp


Index: lib/Support/StringSaver.cpp
===================================================================
--- lib/Support/StringSaver.cpp
+++ lib/Support/StringSaver.cpp
@@ -13,7 +13,8 @@
 
 StringRef StringSaver::save(StringRef S) {
   char *P = Alloc.Allocate<char>(S.size() + 1);
-  memcpy(P, S.data(), S.size());
+  if (!S.empty())
+    memcpy(P, S.data(), S.size());
   P[S.size()] = '\0';
   return StringRef(P, S.size());
 }



Index: lib/Support/StringSaver.cpp
===================================================================
--- lib/Support/StringSaver.cpp
+++ lib/Support/StringSaver.cpp
@@ -13,7 +13,8 @@
 
 StringRef StringSaver::save(StringRef S) {
   char *P = Alloc.Allocate<char>(S.size() + 1);
-  memcpy(P, S.data(), S.size());
+  if (!S.empty())
+    memcpy(P, S.data(), S.size());
   P[S.size()] = '\0';
   return StringRef(P, S.size());
 }

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