From: Li Zefan <lizf@cn.fujitsu.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Steven Rostedt <rostedt@goodmis.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/5] blktrace: fix off-by-one bug
Date: Tue, 24 Mar 2009 16:41:32 +0800 [thread overview]
Message-ID: <49C89CBC.4030600@cn.fujitsu.com> (raw)
In-Reply-To: <49C89ACE.9070102@cn.fujitsu.com>
Li Zefan wrote:
>>> - if (unlikely(what == 0 || what > ARRAY_SIZE(what2act)))
>>> + if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
>> ah, nice. How did you notice - did we miss "remap" events due to
>> this bug?
>>
forgot to mention, we didn't miss any "remap" events.
>
> By code review, but we can get NULL dereference bug if we receive an
> "abort" event, this event may be generated only when using device-mapper.
>
and not NULL dereference, but accessing invalid memory.
what2act["abort"]->print(...)
and "abort" == ARRAY_SIZE(what2act).
> We don't print out this event currently, neither does the userspace
> blktrace, which should be fixed.
>
next prev parent reply other threads:[~2009-03-24 8:41 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 8:04 [PATCH 0/5] blktrace: various cleanups and fixes, part 2 Li Zefan
2009-03-24 8:04 ` [PATCH 1/5] blktrace: mark ddir_act and what2act const Li Zefan
2009-03-24 12:12 ` [tip:tracing/blktrace] blktrace: mark ddir_act[] const Li Zefan
2009-03-24 12:49 ` [PATCH 1/5] blktrace: mark ddir_act and what2act const Arnaldo Carvalho de Melo
2009-03-24 8:05 ` [PATCH 2/5] blktrace: fix wrong calculation of RWBS Li Zefan
2009-03-24 12:12 ` [tip:tracing/blktrace] " Li Zefan
2009-03-24 8:05 ` [PATCH 3/5] blktrace: fix off-by-one bug Li Zefan
2009-03-24 8:27 ` Ingo Molnar
2009-03-24 8:33 ` Li Zefan
2009-03-24 8:41 ` Li Zefan [this message]
2009-03-24 8:47 ` Ingo Molnar
2009-03-24 8:50 ` Li Zefan
2009-03-25 1:21 ` Li Zefan
2009-03-25 13:15 ` [tip:tracing/blktrace] " Li Zefan
2009-03-24 8:05 ` [PATCH 4/5] blktrace: fix t_error() Li Zefan
2009-03-24 8:44 ` Ingo Molnar
2009-03-24 12:12 ` [tip:tracing/blktrace] " Li Zefan
2009-03-24 12:51 ` [PATCH 4/5] " Arnaldo Carvalho de Melo
2009-03-24 8:06 ` [PATCH 5/5] blktrace: print human-readable act_mask Li Zefan
2009-03-24 8:39 ` Ingo Molnar
2009-03-24 9:01 ` Li Zefan
2009-03-24 8:39 ` Ingo Molnar
2009-03-24 8:46 ` Li Zefan
2009-03-24 9:43 ` Li Zefan
2009-03-24 9:48 ` Ingo Molnar
2009-03-24 12:12 ` [tip:tracing/blktrace] " Li Zefan
2009-03-24 15:48 ` [PATCH 5/5] " Steven Rostedt
2009-03-24 15:49 ` Steven Rostedt
2009-03-24 15:56 ` Ingo Molnar
2009-03-24 16:04 ` Steven Rostedt
2009-03-24 16:06 ` Steven Rostedt
2009-03-25 2:55 ` Li Zefan
2009-03-24 11:49 ` [PATCH 0/5] blktrace: various cleanups and fixes, part 2 Jens Axboe
2009-03-24 12:10 ` Ingo Molnar
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