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efi: Make for_each_efi_memory_desc_in_map() cope with running on Xen

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While commit 55f1ea1521 ("efi: Fix for_each_efi_memory_desc_in_map()
for empty memmaps") made an attempt to deal with empty memory maps, it
didn't address the case where the map field never gets set, as is
apparently the case when running under Xen.

Reported-by: <lists@ssl-mail.com>
Tested-by: <lists@ssl-mail.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: <stable@vger.kernel.org> # v4.7+
Signed-off-by: Jan Beulich <jbeulich@suse.com>
[ Guard the loop with a NULL check instead of pointer underflow ]
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Jan Beulich 2016-08-15 09:05:45 -06:00 committed by Matt Fleming
parent c6935931c1
commit d4c4fed08f
1 changed files with 1 additions and 1 deletions
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2
include/linux/efi.h
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@ -946,7 +946,7 @@ extern int efi_memattr_apply_permissions(struct mm_struct *mm,
/* Iterate through an efi_memory_map */
#define for_each_efi_memory_desc_in_map(m, md) \
for ((md) = (m)->map; \
((void *)(md) + (m)->desc_size) <= (m)->map_end; \
(md) && ((void *)(md) + (m)->desc_size) <= (m)->map_end; \
(md) = (void *)(md) + (m)->desc_size)
/**