linux-kernel - [PATCH 0/2] Clang: avoid undefined behavior in llist iterators

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Message-Id: <1474636978-41435-1-git-send-email-glider@google.com>
Date:   Fri, 23 Sep 2016 15:22:56 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     dvyukov@...gle.com, kcc@...gle.com, akpm@...ux-foundation.org,
        edumazet@...gle.com, mingo@...e.hu
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] Clang: avoid undefined behavior in llist iterators

This patch set fixes problems with pointer arithmetics overflow in
llist iterators, llist_for_each_entry() and llist_for_each_entry_safe().
Clang turns those macros into infinite loops, because they're operating
with "negative" pointers.

As a follow-up it may make sense to convert other uses of llist_entry()
to llist_entry_safe(), or even replace uses of container_of() with
container_of_safe().

Alexander Potapenko (2):
  include/linux: provide a safe version of container_of()
  llist: introduce llist_entry_safe()

 include/linux/kernel.h | 15 +++++++++++++++
 include/linux/llist.h  | 26 +++++++++++++++++++-------
 2 files changed, 34 insertions(+), 7 deletions(-)

-- 
2.8.0.rc3.226.g39d4020