https://gcc.gnu.org/g:0a4fff071ff48d699b1af94b88f8878da006c770 commit r11-10282-g0a4fff071ff48d699b1af94b88f8878da006c770 Author: Harald Anlauf <anlauf@gmx.de> Date: Tue Sep 20 22:23:43 2022 +0200 Fortran: NULL pointer dereference in invalid simplification [PR106985] gcc/fortran/ChangeLog: PR fortran/106985 * expr.c (gfc_simplify_expr): Avoid NULL pointer dereference. gcc/testsuite/ChangeLog: PR fortran/106985 * gfortran.dg/pr106985.f90: New test. (cherry picked from commit 8dbb15bc2d019488240c1e69d93121b0347ac092) Diff: --- gcc/fortran/expr.c | 3 ++- gcc/testsuite/gfortran.dg/pr106985.f90 | 8 ++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/gcc/fortran/expr.c b/gcc/fortran/expr.c index 6f27b4bf440..64fdd04221f 100644 --- a/gcc/fortran/expr.c +++ b/gcc/fortran/expr.c @@ -2283,7 +2283,8 @@ gfc_simplify_expr (gfc_expr *p, int type) initialization expression, or we want a subsection. */ if (p->symtree->n.sym->attr.flavor == FL_PARAMETER && (gfc_init_expr_flag || p->ref - || p->symtree->n.sym->value->expr_type != EXPR_ARRAY)) + || (p->symtree->n.sym->value + && p->symtree->n.sym->value->expr_type != EXPR_ARRAY))) { if (!simplify_parameter_variable (p, type)) return false; diff --git a/gcc/testsuite/gfortran.dg/pr106985.f90 b/gcc/testsuite/gfortran.dg/pr106985.f90 new file mode 100644 index 00000000000..f4ed92577a3 --- /dev/null +++ b/gcc/testsuite/gfortran.dg/pr106985.f90 @@ -0,0 +1,8 @@ +! { dg-do compile } +! PR fortran/106985 - ICE in gfc_simplify_expr +! Contributed by G.Steinmetz + +program p + integer, parameter :: a(2) = 1 + integer, parameter :: b = a(2) + b ! { dg-error "before its definition is complete" } +end