diff --git a/mm/bounce.c b/mm/bounce.c
index bf0cf7c..e590272 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -198,8 +198,13 @@
 		/*
 		 * irk, bounce it
 		 */
-		if (!bio)
-			bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
+		if (!bio) {
+			unsigned int cnt = (*bio_orig)->bi_vcnt;
+
+			bio = bio_alloc(GFP_NOIO, cnt);
+			memset(bio->bi_io_vec, 0, cnt * sizeof(struct bio_vec));
+		}
+			
 
 		to = bio->bi_io_vec + i;