[PR fortran/77583, patch ]- ICE in pp_quoted_string, at pretty-print.c:966

[Harald Anlauf <anlauf@gmx.de>]

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The attached patch (originally by Steve Kargl) fixes a NULL pointer
dereference that may occur when checking for a conflict.

Regtested successfully.

OK for trunk?  Backport to active branches?

Thanks,
Harald

2019-03-02  Harald Anlauf  <anlauf@gmx.de>
	    Steve Kargl  <sgk@troutmask.apl.washington.edu>

	PR fortran/77583
	* symbol.c (check_conflict): Check for valid procedure name
	passed to error reporting routine.

2019-03-02  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/77583
	* gfortran.dg/pr77583.f90: New test.


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Index: gcc/fortran/symbol.c
===================================================================
--- gcc/fortran/symbol.c	(revision 269332)
+++ gcc/fortran/symbol.c	(working copy)
@@ -525,7 +525,7 @@
   /* The copying of procedure dummy arguments for module procedures in
      a submodule occur whilst the current state is COMP_CONTAINS. It
      is necessary, therefore, to let this through.  */
-  if (attr->dummy
+  if (name && attr->dummy
       && (attr->function || attr->subroutine)
       && gfc_current_state () == COMP_CONTAINS
       && !(gfc_new_block && gfc_new_block->abr_modproc_decl))

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Index: gcc/testsuite/gfortran.dg/pr77583.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr77583.f90	(nonexistent)
+++ gcc/testsuite/gfortran.dg/pr77583.f90	(working copy)
@@ -0,0 +1,10 @@
+! { dg-do compile }
+!
+! PR fortran/77583 - ICE in pp_quoted_string, at pretty-print.c:966
+! Contributed by Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de>
+
+pure subroutine sub(s)
+contains
+   pure subroutine s  ! { dg-error "conflicts with DUMMY argument" }
+   end
+end