fix check for undefined behavior

6 years ago · 50fb80cdd8
parent fbbbc45ae5
commit 50fb80cdd8
1 changed files with 1 additions and 1 deletions
--- a/src/google/protobuf/stubs/structurally_valid.cc
+++ b/src/google/protobuf/stubs/structurally_valid.cc
@ -395,7 +395,7 @@ int UTF8GenericScan(const UTF8ScanObj* st,
  const uint8* isrc = reinterpret_cast<const uint8*>(str);
  const uint8* src = isrc;
  const uint8* srclimit = isrc + str_length;
-  const uint8* srclimit8 = srclimit - 7;
+  const uint8* srclimit8 = str_length < 7 ? isrc : srclimit - 7;
  const uint8* Tbl_0 = &st->state_table[st->state0];
 DoAgain: