While commit 55f1ea15216 ("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 desc_size field never gets set, as is
apparently the case when running under Xen.
Reported-by: <lists@xxxxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Tested-by: <lists@xxxxxxxxxxxx>
---
include/linux/efi.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 4.8-rc1/include/linux/efi.h
+++ 4.8-rc1-EFI-memdesc-iterator-Xen/include/linux/efi.h
@@ -946,7 +946,7 @@ extern int efi_memattr_apply_permissions
/* 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; \
+ ((void *)(md) + (m)->desc_size - 1) < (m)->map_end; \
(md) = (void *)(md) + (m)->desc_size)
/**
--
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