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23 lines
716 B
Diff
23 lines
716 B
Diff
From: Andrew Cooper <andrew.cooper3@citrix.com>
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Subject: grant_table: fix GNTTABOP_cache_flush handling
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Don't fall over a NULL grant_table pointer when the owner of the domain
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is a system domain (DOMID_{XEN,IO} etc).
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This is XSA-232.
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Reported-by: Matthew Daley <mattd@bugfuzz.com>
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Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
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Reviewed-by: Jan Beulich <jbeulich@suse.com>
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--- a/xen/common/grant_table.c
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+++ b/xen/common/grant_table.c
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@@ -3053,7 +3053,7 @@ static int cache_flush(gnttab_cache_flus
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page = mfn_to_page(mfn);
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owner = page_get_owner_and_reference(page);
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- if ( !owner )
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+ if ( !owner || !owner->grant_table )
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{
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rcu_unlock_domain(d);
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return -EPERM;
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