[PATCH RFC 2/6] purgatory: No need to sha256 update if ptr->len is zero

[Pratyush Anand]

If ptr->len is zero we do not need to update sha256.

Signed-off-by: Pratyush Anand <panand at redhat.com>
---
 purgatory/purgatory.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/purgatory/purgatory.c b/purgatory/purgatory.c
index 3bbcc0935ad5..f8ed69b8fbfb 100644
--- a/purgatory/purgatory.c
+++ b/purgatory/purgatory.c
@@ -18,6 +18,8 @@ int verify_sha256_digest(void)
 	sha256_starts(&ctx);
 	end = &sha256_regions[sizeof(sha256_regions)/sizeof(sha256_regions[0])];
 	for(ptr = sha256_regions; ptr < end; ptr++) {
+		if (ptr->len == 0)
+			continue;
 		sha256_update(&ctx, (uint8_t *)((uintptr_t)ptr->start),
 			      ptr->len);
 	}
-- 
2.1.0