[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] libxc: check in xc_get_tot_pages() that the proper domain is reported
On 02/12/14 15:18, Vitaly Kuznetsov wrote: > XEN_DOMCTL_getdomaininfo, which is being used by xc_domain_getinfo(), has > strange interface: it reports first domain which has domid >= requested domid > so all callers are supposed to check that the proper domain(s) was queried > by checking domid. xc_get_tot_pages() doesn't do that. In case the requested > domain was destroyed it will report first domain with domid > requested domid > which is apparently misleading as there is no way xc_get_tot_pages() callers > can figure out that they got tot_pages for some other domain. > > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CCing Konrad as this really should get a 4.5 release ack. It is a straight bugfix. > --- > tools/libxc/xc_private.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/tools/libxc/xc_private.c b/tools/libxc/xc_private.c > index 1c214dd..e2441ad 100644 > --- a/tools/libxc/xc_private.c > +++ b/tools/libxc/xc_private.c > @@ -613,8 +613,10 @@ int xc_get_pfn_list(xc_interface *xch, > long xc_get_tot_pages(xc_interface *xch, uint32_t domid) > { > xc_dominfo_t info; > - return (xc_domain_getinfo(xch, domid, 1, &info) != 1) ? > - -1 : info.nr_pages; > + if ( (xc_domain_getinfo(xch, domid, 1, &info) != 1) || > + (info.domid != domid) ) > + return -1; > + return info.nr_pages; > } > > int xc_copy_to_domain_page(xc_interface *xch, _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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