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Xen/x86: also check kernel mapping in set_foreign_p2m_mapping()

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We should not set up further state if either mapping failed; paying
attention to just the user mapping's status isn't enough.

Also use GNTST_okay instead of implying its value (zero).

This is part of XSA-361.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: stable@vger.kernel.org
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jan Beulich 2021-02-15 08:50:08 +01:00 committed by Juergen Gross
parent a35f2ef3b7
commit b512e1b077
1 changed files with 2 additions and 1 deletions
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3
arch/x86/xen/p2m.c
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@ -712,7 +712,8 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
unsigned long mfn, pfn;
/* Do not add to override if the map failed. */
if (map_ops[i].status)
if (map_ops[i].status != GNTST_okay ||
(kmap_ops && kmap_ops[i].status != GNTST_okay))
continue;
if (map_ops[i].flags & GNTMAP_contains_pte) {