[PATCH, committed] Fortran: avoid NULL pointer dereference on invalid DATA constant [PR99349]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

I've committed the attached fix for a NULL pointer dereference
as obvious after a discussion with Steve in the PR, and
successful regtesting on x86_64-pc-linux-gnu, as r13-2382.

See also https://gcc.gnu.org/g:b6aa7d45b502c01f8703c8d2cee2690f9aa8e282

Thanks,
Harald


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From b6aa7d45b502c01f8703c8d2cee2690f9aa8e282 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Fri, 2 Sep 2022 21:07:26 +0200
Subject: [PATCH] Fortran: avoid NULL pointer dereference on invalid DATA
 constant [PR99349]

gcc/fortran/ChangeLog:

	PR fortran/99349
	* decl.cc (match_data_constant): Avoid NULL pointer dereference.

gcc/testsuite/ChangeLog:

	PR fortran/99349
	* gfortran.dg/pr99349.f90: New test.

Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>
---
 gcc/fortran/decl.cc                   | 3 ++-
 gcc/testsuite/gfortran.dg/pr99349.f90 | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gfortran.dg/pr99349.f90

diff --git a/gcc/fortran/decl.cc b/gcc/fortran/decl.cc
index b6400514731..0f9b2ced4c2 100644
--- a/gcc/fortran/decl.cc
+++ b/gcc/fortran/decl.cc
@@ -423,7 +423,8 @@ match_data_constant (gfc_expr **result)
 	 data-pointer-initialization compatible (7.5.4.6) with the initial
 	 data target; the data statement object is initially associated
 	 with the target.  */
-      if ((*result)->symtree->n.sym->attr.save
+      if ((*result)->symtree
+	  && (*result)->symtree->n.sym->attr.save
 	  && (*result)->symtree->n.sym->attr.target)
 	return m;
       gfc_free_expr (*result);
diff --git a/gcc/testsuite/gfortran.dg/pr99349.f90 b/gcc/testsuite/gfortran.dg/pr99349.f90
new file mode 100644
index 00000000000..e1f4628af0b
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr99349.f90
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! PR fortran/99349 - ICE in match_data_constant
+! Contributed by G.Steinmetz
+
+function f()
+  logical, parameter :: a((1.)/0) = .true. ! { dg-error "Parameter array" }
+  integer :: b
+  data b /a%kind/ ! { dg-error "Syntax error" }
+end
--
2.35.3