linux-kernel - Re: [PATCH] RDMA/rxe: Use kzalloc() to alloc map

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Message-ID: <d956bac8-36a6-0148-6f9c-fa43c8c272a7@fujitsu.com>
Date:   Mon, 23 May 2022 22:02:56 +0800
From:   "Li, Zhijian" <lizhijian@...itsu.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Zhu Yanjun <zyjzyj2000@...il.com>, <linux-rdma@...r.kernel.org>,
        Bob Pearson <rpearsonhpe@...il.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/rxe: Use kzalloc() to alloc map_set


on 2022/5/20 22:45, Jason Gunthorpe wrote:
> On Wed, May 18, 2022 at 12:37:25PM +0800, Li Zhijian wrote:
>> Below call chains will alloc map_set without fully initializing map_set.
>> rxe_mr_init_fast()
>>   -> rxe_mr_alloc()
>>      -> rxe_mr_alloc_map_set()
>>
>> Uninitialized values inside struct rxe_map_set are possible to cause
>> kernel panic.
> If the value is uninitialized then why is 0 an OK value?
>
> Would be happier to know the exact value that is not initialized

Well, good question. After re-think of this issue, it seems this patch 
wasn't the root cause though it made the crash disappear in some extent.

I'm still working on the root cause :)

Thanks

Zhijian


>
> Jason