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From: "jcmvbkbc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107482] New: out-of-bounds heap access in IRA
Date: Mon, 31 Oct 2022 20:53:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107482

            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=3D53806&action=3Dedit
_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=3Dmicroblazeel-linux-gnu:

$ gcc/cc1 -O2 _gcov.i
../../../../gcc/libgcc/libgcov-driver.c: In function =E2=80=98gcov_do_dump.=
constprop=E2=80=99:
../../../../gcc/libgcc/libgcov-driver.c:704:1: internal compiler error: in
assign_hard_reg, at ira-color.cc:2006=