linux-kernel - Re: [PATCH v2] initramfs: Fix a missing-chek bug in dir

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Message-ID: <20190524034517.GA6821@zhanggen-UX430UQ>
Date:   Fri, 24 May 2019 11:45:17 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     rppt@...ux.ibm.com, david.engraf@...go.com, steven.price@....com,
        osandov@...com, luc.vanoostenryck@...il.com, axboe@...nel.dk,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] initramfs: Fix a missing-chek bug in dir_add()teven.price@....com、

On Thu, May 23, 2019 at 08:35:23PM -0700, Andrew Morton wrote:
> On Fri, 24 May 2019 11:30:45 +0800 Gen Zhang <blackgod016574@...il.com> wrote:
> 
> > In dir_add() and do_name(), de->name and vcollected are allocated by
> > kstrdup(). And de->name and vcollected are dereferenced in the following
> > codes. However, memory allocation functions such as kstrdup() may fail. 
> > Dereferencing this null pointer may cause the kernel go wrong. Thus we
> > should check these two kstrdup() operations.
> > Further, if kstrdup() returns NULL, we should free de in dir_add().
> 
> We generally assume that memory allocations within __init code cannot
> fail.  If one does fail, something quite horrid has happened.  The
> resulting oops will provide the same information as the proposed panic()
> anyway.
Thanks for your reply, Andrew.
You mean that it is not necessary to check memory allcoation in __init,
right?
Thanks
Gen