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

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Message-ID: <20220520144511.GA2302907@nvidia.com>
Date:   Fri, 20 May 2022 11:45:11 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Li Zhijian <lizhijian@...itsu.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 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

Jason