From: Harald Anlauf <anlauf@gmx.de>
Date: Mon, 29 Jun 2020 21:20:16 +0000 (+0200)
Subject: PR fortran/95978 - ICE in gfc_match_data, at fortran/decl.c:731
X-Git-Tag: basepoints/gcc-12~6537
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=583812c2e2f3593823622b0a5821d957c832dbd0;p=thirdparty%2Fgcc.git

PR fortran/95978 - ICE in gfc_match_data, at fortran/decl.c:731

Catch NULL pointer dereference on invalid DATA statement.

gcc/fortran/
	PR fortran/95978
	* decl.c (gfc_match_data): Avoid NULL pointer dereference.
---

diff --git a/gcc/fortran/decl.c b/gcc/fortran/decl.c
index ac1f63f66e0e..f38def4c2914 100644
--- a/gcc/fortran/decl.c
+++ b/gcc/fortran/decl.c
@@ -728,7 +728,7 @@ gfc_match_data (void)
 	  gfc_constructor *c;
 	  c = gfc_constructor_first (new_data->value->expr->value.constructor);
 	  for (; c; c = gfc_constructor_next (c))
-	    if (c->expr->ts.type == BT_BOZ)
+	    if (c->expr && c->expr->ts.type == BT_BOZ)
 	      {
 		gfc_error ("BOZ literal constant at %L cannot appear in a "
 			   "structure constructor", &c->expr->where);
diff --git a/gcc/testsuite/gfortran.dg/pr95978.f90 b/gcc/testsuite/gfortran.dg/pr95978.f90
new file mode 100644
index 000000000000..47bd70670963
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr95978.f90
@@ -0,0 +1,10 @@
+! { dg-do compile }
+! PR fortran/95978 - ICE in gfc_match_data, at fortran/decl.c:731
+
+program p
+  type t
+     integer :: a
+     type(t), allocatable :: b
+     data c /t(1)/               ! { dg-error "Unexpected DATA statement" }
+  end type t
+end