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Xen/x86: also check kernel mapping in set_foreign_p2m_mapping()
commit b512e1b077
upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 2 additions and 1 deletions
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@ -716,7 +716,8 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
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unsigned long mfn, pfn;
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/* Do not add to override if the map failed. */
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if (map_ops[i].status)
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if (map_ops[i].status != GNTST_okay ||
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(kmap_ops && kmap_ops[i].status != GNTST_okay))
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continue;
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if (map_ops[i].flags & GNTMAP_contains_pte) {
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