linux-kernel - Re: [PATCH v2] fuse: break infinite loop in fuse_fill_write

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Message-ID: <CAJfpegtzWfJg=JN9s+fn5sawL2U7z8kiYTgrnmDOX7E_MqFBqA@mail.gmail.com>
Date:	Tue, 10 Nov 2015 15:41:50 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Roman Gushchin <klamm@...dex-team.ru>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Subject: Re: [PATCH v2] fuse: break infinite loop in fuse_fill_write_pages()

On Mon, Oct 12, 2015 at 3:33 PM, Roman Gushchin <klamm@...dex-team.ru> wrote:
> I got a report about unkillable task eating CPU. Further
> investigation shows, that the problem is in the fuse_fill_write_pages()
> function. If iov's first segment has zero length, we get an infinite
> loop, because we never reach iov_iter_advance() call.
>
> Fix this by calling iov_iter_advance() before repeating an attempt to
> copy data from userspace.

Thanks, queued in

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next

Miklos
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