[edit] Don't hit an assert when trying to delete a trailing space at EOF

The buffer is guaranteed to be zero-terminated so we can just
circumvent the check. Found by afl-fuzz.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@233496 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/Edit/EditedSource.cpp b/lib/Edit/EditedSource.cpp
index a5b5875b19..e557de9241 100644
--- a/lib/Edit/EditedSource.cpp
+++ b/lib/Edit/EditedSource.cpp
@@ -295,9 +295,11 @@ static void adjustRemoval(const SourceManager &SM, const LangOptions &LangOpts,
   }
 
   if (buffer[end] == ' ') {
+    assert((end + 1 != buffer.size() || buffer.data()[end + 1] == 0) &&
+           "buffer not zero-terminated!");
     if (canRemoveWhitespace(/*left=*/buffer[begin-1],
                             /*beforeWSpace=*/buffer[end-1],
-                            /*right=*/buffer[end+1],
+                            /*right=*/buffer.data()[end + 1], // zero-terminated
                             LangOpts))
       ++len;
     return;