linux-kernel - Re: [PATCH v2] kasan/quarantine: fix bugs on qlist_move

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Date:	Fri, 1 Jul 2016 23:03:13 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2] kasan/quarantine: fix bugs on qlist_move_cache()

2016-07-01 22:55 GMT+09:00  <js1304@...il.com>:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
>
> There are two bugs on qlist_move_cache(). One is that qlist's tail
> isn't set properly. curr->next can be NULL since it is singly linked
> list and NULL value on tail is invalid if there is one item on qlist.
> Another one is that if cache is matched, qlist_put() is called and
> it will set curr->next to NULL. It would cause to stop the loop
> prematurely.
>
> These problems come from complicated implementation so I'd like to
> re-implement it completely. Implementation in this patch is really
> simple. Iterate all qlist_nodes and put them to appropriate list.
>
> Unfortunately, I got this bug sometime ago and lose oops message.
> But, the bug looks trivial and no need to attach oops.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Please ignore this. It causes build warning. Please see v3.
Sorry for noise.

Thanks.