linux-kernel - Re: [PATCH v5] kasan/quarantine: fix bugs on qlist_move

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Date:	Wed, 6 Jul 2016 10:40:45 +0300
From:	Andrey Ryabinin <aryabinin@...tuozzo.com>
To:	<js1304@...il.com>, Andrew Morton <akpm@...ux-foundation.org>
CC:	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	<kasan-dev@...glegroups.com>,
	Kuthonuzo Luruo <poll.stdin@...il.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v5] kasan/quarantine: fix bugs on qlist_move_cache()



On 07/06/2016 03:52 AM, js1304@...il.com wrote:
> 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.
> 
> v5: rename some variable for better readability
> v4: fix cache size bug s/cache->size/obj_cache->size/
> v3: fix build warning
> 
> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Fixes: 55834c59098d ("mm: kasan: initial memory quarantine implementation")
Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>