block: Always check length of all iov entries in blk_rq_map_user_iov()

Even after commit 5478755616ae2ef1ce144dded589b62b2a50d575
("block: check for proper length of iov entries earlier ...")
we still won't check for zero-length entries after an unaligned
entry.  Remove the break-statement, so all entries are checked.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-map.c b/block/blk-map.c
index e663ac2d8e68f70ff17ce274f3cebec16c1dd18c..164cd0059706214e53c01b780b353fca98d9b829 100644 (file)
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -204,10 +204,11 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
                if (!iov[i].iov_len)
                        return -EINVAL;
 
-               if (uaddr & queue_dma_alignment(q)) {
+               /*
+                * Keep going so we check length of all segments
+                */
+               if (uaddr & queue_dma_alignment(q))
                        unaligned = 1;
-                       break;
-               }
        }
 
        if (unaligned || (q->dma_pad_mask & len) || map_data)