diff options
| author | Jan Beulich <[email protected]> | 2016-08-15 09:05:45 -0600 |
|---|---|---|
| committer | Matt Fleming <[email protected]> | 2016-09-05 11:16:56 +0100 |
| commit | d4c4fed08f31f3746000c46cb1b20bed2959547a (patch) | |
| tree | 51f46dc044388ff3f00a15c5054b6848c56ec816 | |
| parent | c6935931c1894ff857616ff8549b61236a19148f (diff) | |
efi: Make for_each_efi_memory_desc_in_map() cope with running on Xen
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: <[email protected]>
Tested-by: <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: <[email protected]> # v4.7+
Signed-off-by: Jan Beulich <[email protected]>
[ Guard the loop with a NULL check instead of pointer underflow ]
Signed-off-by: Matt Fleming <[email protected]>
| -rw-r--r-- | include/linux/efi.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h index 7f5a58225385..23cd3ced8c1a 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -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) /** |