From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [PATCH] tools/libxc: Don't leave scratch_pfn
 uninitialised if the domain has no memory
Date: Mon, 2 Feb 2015 15:26:37 +0000
Message-ID: <1422890797.5695.6.camel@citrix.com>
References: <1422460355-16163-1-git-send-email-andrew.cooper3@citrix.com>
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To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Julien Grall <julien.grall@linaro.org>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Jan Beulich <JBeulich@suse.com>, Xen-devel <xen-devel@lists.xen.org>
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On Wed, 2015-01-28 at 15:52 +0000, Andrew Cooper wrote:
> c/s 5b5c40c0d1 "libxc: introduce a per architecture scratch pfn for temporary
> grant mapping" accidentally an issue whereby there were two paths out of
> xc_core_arch_get_scratch_gpfn() which returned 0, but only one of which
> assigned a value to the gpfn parameter.
> 
> xc_domain_maximum_gpfn() can validly return 0, at which point gpfn 1 is a
> valid scratch page to use.
> 
> In addition, widen rc before adding 1 and possibly overflowing.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Julien Grall <julien.grall@linaro.org>
> CC: Jan Beulich <JBeulich@suse.com>
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>

Acked + applied, thanks.