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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/104649] ICE in gfc_match_formal_arglist, at
 fortran/decl.cc:6733 since r6-1958-g4668d6f9c00d4767
Date: Tue, 17 May 2022 17:44:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104649

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org
           Priority|P3                          |P4

--- Comment #2 from kargl at gcc dot gnu.org ---
Null pointer dereference.


diff --git a/gcc/fortran/decl.cc b/gcc/fortran/decl.cc
index bd586e75008..8e2cd511c4d 100644
--- a/gcc/fortran/decl.cc
+++ b/gcc/fortran/decl.cc
@@ -6730,12 +6730,20 @@ ok:
              || (p->next =3D=3D NULL && q->next !=3D NULL))
            arg_count_mismatch =3D true;
          else if ((p->sym =3D=3D NULL && q->sym =3D=3D NULL)
-                   || strcmp (p->sym->name, q->sym->name) =3D=3D 0)
+                   || (p->sym && q->sym
+                       && strcmp (p->sym->name, q->sym->name) =3D=3D 0))
            continue;
          else
-           gfc_error_now ("Mismatch in MODULE PROCEDURE formal "
-                          "argument names (%s/%s) at %C",
-                          p->sym->name, q->sym->name);
+           {
+             if (q->sym)
+               gfc_error_now ("Mismatch in MODULE PROCEDURE formal "
+                               "argument names (%qs/%qs) at %C",
+                               p->sym->name, q->sym->name);
+             else
+               gfc_error_now ("Mismatch in MODULE PROCEDURE formal argumen=
t "
+                               "name, %qs, and alternate return at %C",
+                               p->sym->name);
+           }
        }

       if (arg_count_mismatch)=