This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug sanitizer/82072] sanitizer does not detect an overflow from LLONG_MIN
- From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 01 Sep 2017 14:22:30 +0000
- Subject: [Bug sanitizer/82072] sanitizer does not detect an overflow from LLONG_MIN
- Auto-submitted: auto-generated
- References: <bug-82072-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82072
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-09-01
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
We have
i = i - lmin
where i is int and lmin is long int, so what we should produce is
i = (int) ((long int) i - lmin)
but instead we produce
i = (int) ((unsigned int) i - (unsigned int) lmin);
This is do_narrow at work.