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From: Andrew Morton <>
To: Gen Zhang <>
Subject: Re: [PATCH v2] initramfs: Fix a missing-chek bug in dir_add()
Date: Thu, 23 May 2019 20:35:23 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <20190524033045.GA6628@zhanggen-UX430UQ>

On Fri, 24 May 2019 11:30:45 +0800 Gen Zhang <> 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()

  reply	other threads:[~2019-05-24  3:35 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-24  3:30 Gen Zhang
2019-05-24  3:35 ` Andrew Morton [this message]
2019-05-24  3:45   ` [PATCH v2] initramfs: Fix a missing-chek bug in dir_add()、 Gen Zhang

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