Prevent potential buffer overrun in onigmo

A code pattern `p + enclen(enc, p, pend)` may lead to a buffer overrun
if incomplete bytes of a UTF-8 character is placed at the end of a
string. Because this pattern is used in several places in onigmo,
this change fixes the issue in the side of `enclen`: the function should
not return a number that is larger than `pend - p`.

Co-Authored-By: Nobuyoshi Nakada <[email protected]>

1 files changed, 0 insertions, 1 deletions

diff --git a/regparse.c b/regparse.c
index 513e0a8c7a..4ebd5f1c46 100644
--- a/regparse.c
+++ b/regparse.c
@@ -3799,7 +3799,6 @@ fetch_token(OnigToken* tok, UChar** src, UChar* end, ScanEnv* env)
 	}
 	else { /* string */
 	  p = tok->backp + enclen(enc, tok->backp, end);
-	  if (p > end) return ONIGERR_END_PATTERN_AT_ESCAPE;
 	}
       }
       break;