[PATCH 4.7 135/184] efi: Make for_each_efi_memory_desc_in_map() cope with running on Xen

[Greg Kroah-Hartman]

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Beulich <JBeulich@xxxxxxxx>

commit d4c4fed08f31f3746000c46cb1b20bed2959547a upstream.

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 map field never gets set, as is
apparently the case when running under Xen.

Reported-by: <lists@xxxxxxxxxxxx>
Tested-by: <lists@xxxxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
[ Guard the loop with a NULL check instead of pointer underflow ]
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 include/linux/efi.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1005,7 +1005,7 @@ 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;		   \
+	     (md) && ((void *)(md) + (m)->desc_size) <= (m)->map_end;	   \
 	     (md) = (void *)(md) + (m)->desc_size)
 
 /**