[Bug middle-end/107482] New: out-of-bounds heap access in IRA

["jcmvbkbc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107482

            Bug ID: 107482
           Summary: out-of-bounds heap access in IRA
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jcmvbkbc at gcc dot gnu.org
  Target Milestone: ---

Created attachment 53806
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53806&action=edit
_gcov.i

Inside the functions update_costs_from_allocno and
assign_hard_reg the macro ALLOCNO_COLOR_DATA
may be applied to objects of type 'struct ira_allocno' whose
add_data field wasn't changed in the function color_pass to
point to a memory area sized for struct allocno_color_data.

It triggers ASAN and can be reproduced without ASAN with the attached
patch on a compiler built from revision gcc-13-3563-gf36bba013361
for target=microblazeel-linux-gnu:

$ gcc/cc1 -O2 _gcov.i
../../../../gcc/libgcc/libgcov-driver.c: In function ‘gcov_do_dump.constprop’:
../../../../gcc/libgcc/libgcov-driver.c:704:1: internal compiler error: in
assign_hard_reg, at ira-color.cc:2006