drbd: We can not process BIOs with a size of 0

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 432fe8f6b5d2647218f600ccbf8de688e840e431..e9354931eace6a41203f25d089ded34cd8bb09fd 100644 (file)
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1237,6 +1237,7 @@ read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __
 
        data_size -= dgs;
 
+       ERR_IF(data_size == 0) return NULL;
        ERR_IF(data_size &  0x1ff) return NULL;
        ERR_IF(data_size >  DRBD_MAX_BIO_SIZE) return NULL;