Make sure not to hang if the last header line is truncated before CRLF

jstedfast · Feb 8, 2018 · 801ac47 · 801ac47
1 parent 54b599e
commit 801ac47
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/MimeKit/MimeParser.cs b/MimeKit/MimeParser.cs
@@ -761,8 +761,17 @@ unsafe bool StepHeaders (byte* inbuf, ref bool scanningFieldName, ref bool check
 
 						if (inptr == inend) {
 							// we don't have enough input data
-							left = (int) (inend - start);
+							int available = (int) (inend - start);
+
 							inputIndex = (int) (start - inbuf);
+
+							if (left == available) {
+								state = MimeParserState.Error;
+								headerIndex = 0;
+								return false;
+							}
+
+							left = available;
 							needInput = true;
 							break;
 						}