[Bug fortran/104649] ICE in gfc_match_formal_arglist, at fortran/decl.cc:6733 since r6-1958-g4668d6f9c00d4767

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104649

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 == NULL && q->next != NULL))
            arg_count_mismatch = true;
          else if ((p->sym == NULL && q->sym == NULL)
-                   || strcmp (p->sym->name, q->sym->name) == 0)
+                   || (p->sym && q->sym
+                       && strcmp (p->sym->name, q->sym->name) == 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 argument "
+                               "name, %qs, and alternate return at %C",
+                               p->sym->name);
+           }
        }

       if (arg_count_mismatch)