linux-kernel - Re: [PATCH] fat: Read buffer overflow

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Date:	Sat, 08 Aug 2009 13:12:32 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Roel Kluin <roel.kluin@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fat: Read buffer overflow

On Sat, 2009-08-08 at 19:10 +0900, OGAWA Hirofumi wrote:
> Pekka Enberg <penberg@...helsinki.fi> writes:
> 
> > Yes, but we pass "ulen" to vfat_is_used_badchars(). The value of
> > "ulen" is a returned in the "longlen" argument of xlate_to_uni() which
> > in turn is calculated as follows for the UTF-8 case:
> >
> >   int name_len = strlen(name);
> >   *outlen = utf8s_to_utf16s(name, PATH_MAX, (wchar_t *) outname);
> >   *outlen -= (name_len - len);
> >   *longlen = *outlen;
> >
> > Maybe "*outlen" can never be negative because of some invariants that
> > I don't see but it's so non-obvious to me that I'd like to see the
> > explicit check in vfat_is_used_badchars().
> 
> Ah, good point. Sorry, I was looking my tree. I'm going to submit the
> attached patch on next merge window.
> 
> Is this enough for it?

Fine by me!

			Pekka

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