Fix poss SEGV

for non-null terminated input.

Author: ngg

src/lib_json/json_reader.cpp

@@ -401,7 +401,7 @@ Reader::addComment(Location begin, Location end, CommentPlacement placement) {
 }
 
 bool Reader::readCStyleComment() {
-  while (current_ != end_) {
+  while ((current_ + 1) < end_) {
     Char c = getNextChar();
     if (c == '*' && *current_ == '/')
       break;
@@ -520,7 +520,7 @@ bool Reader::readArray(Token& tokenStart) {
   currentValue().swapPayload(init);
   currentValue().setOffsetStart(tokenStart.start_ - begin_);
   skipSpaces();
-  if (*current_ == ']') // empty array
+  if (current_ != end_ && *current_ == ']') // empty array
   {
     Token endArray;
     readToken(endArray);
@@ -1361,7 +1361,7 @@ OurReader::addComment(Location begin, Location end, CommentPlacement placement)
 }
 
 bool OurReader::readCStyleComment() {
-  while (current_ != end_) {
+  while ((current_ + 1) < end_) {
     Char c = getNextChar();
     if (c == '*' && *current_ == '/')
       break;
@@ -1503,7 +1503,7 @@ bool OurReader::readArray(Token& tokenStart) {
   currentValue().swapPayload(init);
   currentValue().setOffsetStart(tokenStart.start_ - begin_);
   skipSpaces();
-  if (*current_ == ']') // empty array
+  if (current_ != end_ && *current_ == ']') // empty array
   {
     Token endArray;
     readToken(endArray);