epee: fix array underflow in unicode parsing

Reported by minerscan Also independently found by OSS-Fuzz just recently
4 years ago · 8eaf0e189f
parent f0ada2f22b
commit 8eaf0e189f
1 changed files with 1 additions and 1 deletions
--- a/contrib/epee/include/storages/parserse_base_utils.h
+++ b/contrib/epee/include/storages/parserse_base_utils.h
@ -196,7 +196,7 @@ namespace misc_utils
                uint32_t dst = 0;
                for (int i = 0; i < 4; ++i)
                {
-                  const unsigned char tmp = isx[(int)*++it];
+                  const unsigned char tmp = isx[(unsigned char)*++it];
                  CHECK_AND_ASSERT_THROW_MES(tmp != 0xff, "Bad Unicode encoding");
                  dst = dst << 4 | tmp;
                }