From: José Rui Faustino de Sousa <jrfsousa@gmail.com>
Date: Fri, 16 Apr 2021 16:17:21 +0000 (+0000)
Subject: Fortran: Fix ICE due to referencing a NULL pointer [PR100018]
X-Git-Tag: basepoints/gcc-12~33
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98c5b5924de969ae8ab37d140aa85bcca3f3c76c;p=thirdparty%2Fgcc.git

Fortran: Fix ICE due to referencing a NULL pointer [PR100018]

gcc/fortran/ChangeLog:

	PR fortran/100018
	* resolve.c: Add association check before de-referencing pointer.

gcc/testsuite/ChangeLog:

	PR fortran/100018
	* gfortran.dg/PR10018.f90: New test.
---

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 1c9b0c5cb622..dd4b26680e04 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -11999,6 +11999,7 @@ start:
 	    /* Assigning a class object always is a regular assign.  */
 	    if (code->expr2->ts.type == BT_CLASS
 		&& code->expr1->ts.type == BT_CLASS
+		&& CLASS_DATA (code->expr2)
 		&& !CLASS_DATA (code->expr2)->attr.dimension
 		&& !(gfc_expr_attr (code->expr1).proc_pointer
 		     && code->expr2->expr_type == EXPR_VARIABLE
diff --git a/gcc/testsuite/gfortran.dg/PR10018.f90 b/gcc/testsuite/gfortran.dg/PR10018.f90
new file mode 100644
index 000000000000..f1cf2676f854
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/PR10018.f90
@@ -0,0 +1,11 @@
+! { dg-do compile }
+!
+subroutine foo(that)
+  implicit none
+  class(*),  target, intent(in)  :: this
+  class(*), pointer, intent(out) :: that
+
+  that => this
+  return
+end subroutine foo
+! { dg-error "Symbol at \\\(1\\\) is not a DUMMY variable" "" { target "*-*-*" } 5 }