This patch add swsusp_page_is_sign_key() method to hibernate_key.c and
check the page is S4 sign key data when collect saveable page in
snapshot.c to avoid sign key data included in snapshot image.

Reviewed-by: Jiri Kosina <redacted>
Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
---
 kernel/power/snapshot.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 72e2911..9e4c94b 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c

@@ -860,6 +860,9 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
 
 	BUG_ON(!PageHighMem(page));
 
+	if (swsusp_page_is_sign_key(page))
+		return NULL;
+
 	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
 	    PageReserved(page))
 		return NULL;