diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 20f5d301d32d..8de950c63dc3 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -338,6 +338,23 @@ int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
 					extraction_flags, &offset);
 	if (unlikely(ret < 0))
 		goto free_bvec;
+	if (unlikely(ret != bytes)) {
+		/*
+		 * Not all pages could be pinned. This can happen when
+		 * pin_user_pages_fast() returns fewer pages than requested.
+		 * All pages must be pinned to copy user data, so unpin
+		 * whatever we got and fail.
+		 */
+		int npinned = DIV_ROUND_UP(offset + ret, PAGE_SIZE);
+		int i;
+
+		for (i = 0; i < npinned; i++)
+			unpin_user_page(pages[i]);
+		if (pages != stack_pages)
+			kvfree(pages);
+		ret = -EFAULT;
+		goto free_bvec;
+	}
 
 	nr_bvecs = bvec_from_pages(bvec, pages, nr_vecs, bytes, offset,
 				   &is_p2p);