Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android

1 files changed, 7 insertions, 2 deletions

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index f5e9f9310b48..b3b0004ea8ac 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -86,8 +86,13 @@ static void skcipher_free_async_sgls(struct skcipher_async_req *sreq)
 	}
 	sgl = sreq->tsg;
 	n = sg_nents(sgl);
-	for_each_sg(sgl, sg, n, i)
-		put_page(sg_page(sg));
+	for_each_sg(sgl, sg, n, i) {
+		struct page *page = sg_page(sg);
+
+		/* some SGs may not have a page mapped */
+		if (page && atomic_read(&page->_count))
+			put_page(page);
+	}
 
 	kfree(sreq->tsg);
 }