diff mbox series

PR fortran/103718 & PR fortran/103719 - [11/12 Regression] ICE in doloop_contained_procedure_code

Message ID trinity-7114a860-977b-428d-a561-64210151fb9b-1639512507833@3c-app-gmx-bs57
State New
Headers
Series PR fortran/103718 & PR fortran/103719 - [11/12 Regression] ICE in doloop_contained_procedure_code |

Commit Message

Harald Anlauf Dec. 14, 2021, 8:08 p.m. UTC 
  Dear all,

there are several pretty obvious NULL pointer dereferences on
valid and invalid code when checking do-loop contained stuff.
Reported by Gerhard.

Regtested on x86_64-pc-linux-gnu.  OK for mainline/11-branch?

Thanks,
Harald

Comments

Thomas Koenig Dec. 14, 2021, 8:12 p.m. UTC | #1 
Hi Harald,

> there are several pretty obvious NULL pointer dereferences on
> valid and invalid code when checking do-loop contained stuff.
> Reported by Gerhard.
> 
> Regtested on x86_64-pc-linux-gnu.  OK for mainline/11-branch?

OK for both.  Thanks for cleaning this up!

Regards

	Thomas
diff mbox series

Patch

From 89bf4b17022890b539cd4b5dbe9bd9142ff8706c Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 14 Dec 2021 21:02:04 +0100
Subject: [PATCH] Fortran: prevent NULL pointer dereferences checking do-loop
 contained stuff

gcc/fortran/ChangeLog:

	PR fortran/103718
	PR fortran/103719
	* frontend-passes.c (doloop_contained_procedure_code): Add several
	checks to prevent NULL pointer dereferences on valid and invalid
	code called within do-loops.

gcc/testsuite/ChangeLog:

	PR fortran/103718
	PR fortran/103719
	* gfortran.dg/do_check_18.f90: New test.
---
 gcc/fortran/frontend-passes.c             | 17 ++++++++------
 gcc/testsuite/gfortran.dg/do_check_18.f90 | 27 +++++++++++++++++++++++
 2 files changed, 37 insertions(+), 7 deletions(-)
 create mode 100644 gcc/testsuite/gfortran.dg/do_check_18.f90

diff --git a/gcc/fortran/frontend-passes.c b/gcc/fortran/frontend-passes.c
index 57b24a11cbe..c106ee0957a 100644
--- a/gcc/fortran/frontend-passes.c
+++ b/gcc/fortran/frontend-passes.c
@@ -2390,7 +2390,7 @@  doloop_contained_procedure_code (gfc_code **c,
   switch (co->op)
     {
     case EXEC_ASSIGN:
-      if (co->expr1->symtree->n.sym == do_var)
+      if (co->expr1->symtree && co->expr1->symtree->n.sym == do_var)
 	gfc_error_now (errmsg, do_var->name, &co->loc, info->procedure->name,
 		       &info->where_do);
       break;
@@ -2411,14 +2411,14 @@  doloop_contained_procedure_code (gfc_code **c,
       break;

     case EXEC_OPEN:
-      if (co->ext.open->iostat
+      if (co->ext.open && co->ext.open->iostat
 	  && co->ext.open->iostat->symtree->n.sym == do_var)
 	gfc_error_now (errmsg, do_var->name, &co->ext.open->iostat->where,
 		       info->procedure->name, &info->where_do);
       break;

     case EXEC_CLOSE:
-      if (co->ext.close->iostat
+      if (co->ext.close && co->ext.close->iostat
 	  && co->ext.close->iostat->symtree->n.sym == do_var)
 	gfc_error_now (errmsg, do_var->name, &co->ext.close->iostat->where,
 		       info->procedure->name, &info->where_do);
@@ -2429,7 +2429,8 @@  doloop_contained_procedure_code (gfc_code **c,
 	{

 	case EXEC_INQUIRE:
-#define CHECK_INQ(a) do { if (co->ext.inquire->a &&			\
+#define CHECK_INQ(a) do { if (co->ext.inquire    &&			\
+			      co->ext.inquire->a &&			\
 			      co->ext.inquire->a->symtree->n.sym == do_var) \
 	      gfc_error_now (errmsg, do_var->name,			\
 			     &co->ext.inquire->a->where,		\
@@ -2448,21 +2449,23 @@  doloop_contained_procedure_code (gfc_code **c,
 #undef CHECK_INQ

 	case EXEC_READ:
-	  if (co->expr1 && co->expr1->symtree->n.sym == do_var)
+	  if (co->expr1 && co->expr1->symtree
+	      && co->expr1->symtree->n.sym == do_var)
 	    gfc_error_now (errmsg, do_var->name, &co->expr1->where,
 			   info->procedure->name, &info->where_do);

 	  /* Fallthrough.  */

 	case EXEC_WRITE:
-	  if (co->ext.dt->iostat
+	  if (co->ext.dt && co->ext.dt->iostat && co->ext.dt->iostat->symtree
 	      && co->ext.dt->iostat->symtree->n.sym == do_var)
 	    gfc_error_now (errmsg, do_var->name, &co->ext.dt->iostat->where,
 			   info->procedure->name, &info->where_do);
 	  break;

 	case EXEC_IOLENGTH:
-	  if (co->expr1 && co->expr1->symtree->n.sym == do_var)
+	  if (co->expr1 && co->expr1->symtree
+	      && co->expr1->symtree->n.sym == do_var)
 	    gfc_error_now (errmsg, do_var->name, &co->expr1->where,
 			   info->procedure->name, &info->where_do);
 	  break;
diff --git a/gcc/testsuite/gfortran.dg/do_check_18.f90 b/gcc/testsuite/gfortran.dg/do_check_18.f90
new file mode 100644
index 00000000000..b06112aa68f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/do_check_18.f90
@@ -0,0 +1,27 @@ 
+! { dg-do compile }
+! PR103718,
+! PR103719 - ICE in doloop_contained_procedure_code
+! Contributed by G.Steinmetz
+
+subroutine s1
+  integer :: i
+  do i = 1, 2
+     call s
+  end do
+contains
+  subroutine s
+    integer :: n
+    inquire (iolength=n) 0  ! valid
+  end
+end
+
+subroutine s2
+  integer :: i
+  do i = 1, 2
+     call s
+  end do
+contains
+  subroutine s
+    shape(1) = 0    ! { dg-error "Non-variable expression" }
+  end
+end
--
2.26.2