UPSTREAM: futex: Always cleanup owner tid in unlock_pi
If the owner died bit is set at futex_unlock_pi, we currently do not
cleanup the user space futex. So the owner TID of the current owner
(the unlocker) persists. That's observable inconsistant state,
especially when the ownership of the pi state got transferred.
Clean it up unconditionally.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Will Drewry <wad@chromium.org>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: stable@vger.kernel.org
BUG=chromium:377392
TEST=x86-alex build & boot
Change-Id: I01210f5c56b897b722e712edd724c562a8fd8ffd
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/202734
Reviewed-by: Will Drewry <wad@chromium.org>
1 file changed
