2011-07-30 Thomas Koenig <tkoenig@gcc.gnu.org>

	PR fortran/48876
	* expr.c (gfc_simplify_expr):  If end of a string is less
	than zero, set it to zero.

2011-07-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/48876
	* gfortran.dg/string_5.f90:  New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@176961 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 89825e3..6be5141 100644 (file)
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2011-07-30  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+       PR fortran/48876
+       * expr.c (gfc_simplify_expr):  If end of a string is less
+       than zero, set it to zero.
+
 2011-07-28  Jakub Jelinek  <jakub@redhat.com>
 
        PR fortran/31067

diff --git a/gcc/fortran/expr.c b/gcc/fortran/expr.c
index e5394b8..549feee 100644 (file)
--- a/gcc/fortran/expr.c
+++ b/gcc/fortran/expr.c
@@ -1839,6 +1839,9 @@ gfc_simplify_expr (gfc_expr *p, int type)
          if (p->ref && p->ref->u.ss.end)
            gfc_extract_int (p->ref->u.ss.end, &end);
 
+         if (end < 0)
+           end = 0;
+
          s = gfc_get_wide_string (end - start + 2);
          memcpy (s, p->value.character.string + start,
                  (end - start) * sizeof (gfc_char_t));

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 187a808..3a681d8 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2011-07-30  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+       PR fortran/48876
+       * gfortran.dg/string_5.f90:  New test.
+
 2011-07-29  Jason Merrill  <jason@redhat.com>
 
        PR c++/49867

diff --git a/gcc/testsuite/gfortran.dg/string_5.f90 b/gcc/testsuite/gfortran.dg/string_5.f90
new file mode 100644 (file)
index 0000000..87ec709
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/string_5.f90
@@ -0,0 +1,7 @@
+! { dg-do compile }
+! PR fortran/48876 - this used to segfault.
+! Test case contributed by mhp77 (a) gmx.at.
+program test
+  character ::  string =  "string"( : -1 )
+end program test
+