[Bug fortran/104999] [12 Regression] runtime error: pointer index expression with base 0x00000cf67720 overflowed to 0xffffffffea627728

[anlauf at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104999

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gcc dot gnu.org

--- Comment #1 from anlauf at gcc dot gnu.org ---
sstride[0] is likely used uninitialized in gfc_simplify_cshift.

The corresponding runtime version in libgfortran/intrinsics/cshift0.c
initializes this to 0, so the following patch might help here:

diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index 0c15bcb2b0a..233cc42137f 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -2134,6 +2134,7 @@ gfc_simplify_cshift (gfc_expr *array, gfc_expr *shift,
gfc_expr *dim)

   resultvec = XCNEWVEC (gfc_expr *, arraysize);

+  sstride[0] = 0;
   extent[0] = 1;
   count[0] = 0;