commit 4e382f9ee962322d32cf92841c3eb093e15a089b
author Benjamin Kramer <benny.kra@googlemail.com> Tue May 23 20:48:21 2017 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Tue May 23 20:48:21 2017 +0000
tree 0a22f1098591287677e54e59310e5527197bca62
parent f43ece3ff577918e1a68b3f841223da4a2ea97ba

[Frontend] Don't index into an empty string.

Found by msan!

llvm-svn: 303686

clang/lib/Frontend/TextDiagnostic.cpp

diff --git a/clang/lib/Frontend/TextDiagnostic.cpp b/clang/lib/Frontend/TextDiagnostic.cpp
index a18b8c8..c43d9aa 100644
--- a/clang/lib/Frontend/TextDiagnostic.cpp
+++ b/clang/lib/Frontend/TextDiagnostic.cpp
@@ -1252,7 +1252,7 @@
     }
 
     // Finally, remove any blank spaces from the end of CaretLine.
-    while (CaretLine[CaretLine.size() - 1] == ' ')
+    while (!CaretLine.empty() && CaretLine[CaretLine.size() - 1] == ' ')
       CaretLine.erase(CaretLine.end() - 1);
 
     // Emit what we have computed.