diff --git a/[refs] b/[refs]
index 491105711e33..507531f5be52 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 76832d8416430d6dd0575579ca1e00d1a790f4cb
+refs/heads/master: 794e64d5e9c7f088378e093a48eb36a30091d82d
diff --git a/trunk/drivers/block/umem.c b/trunk/drivers/block/umem.c
index 99806f9ee4ce..5f5095afb06b 100644
--- a/trunk/drivers/block/umem.c
+++ b/trunk/drivers/block/umem.c
@@ -484,7 +484,8 @@ static void process_page(unsigned long data)
 		page->idx++;
 		if (page->idx >= bio->bi_vcnt) {
 			page->bio = bio->bi_next;
-			page->idx = page->bio->bi_idx;
+			if (page->bio)
+				page->idx = page->bio->bi_idx;
 		}
 
 		pci_unmap_page(card->dev, desc->data_dma_handle,