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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99688] AddressSanitizer: stack-buffer-overflow on
 address at gfc_match_name(char*) gcc/fortran/match.c:685
Date: Sat, 20 Mar 2021 20:41:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99688

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gcc dot gnu.org

--- Comment #1 from anlauf at gcc dot gnu.org ---
I do not see the issue with valgrind, but does the following obvious patch
help?

diff --git a/gcc/fortran/match.c b/gcc/fortran/match.c
index 4d5890fd523..9941887453f 100644
--- a/gcc/fortran/match.c
+++ b/gcc/fortran/match.c
@@ -6634,7 +6634,7 @@ gfc_match_select_rank (void)
 {
   gfc_expr *expr1, *expr2 =3D NULL;
   match m;
-  char name[GFC_MAX_SYMBOL_LEN];
+  char name[GFC_MAX_SYMBOL_LEN + 1];
   gfc_symbol *sym, *sym2;
   gfc_namespace *ns =3D gfc_current_ns;
   gfc_array_spec *as =3D NULL;

There might be a similar issue with SELECT TYPE (gfc_match_select_type).=