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Subject[patch] drbd: null dereference bug
epoch is always NULL here.

Signed-off-by: Dan Carpenter <error27@gmail.com>
---
This patch has only been compile tested. Sorry. :/

--- orig/drivers/block/drbd/drbd_receiver.c 2010-01-23 10:53:13.000000000 +0300
+++ devel/drivers/block/drbd/drbd_receiver.c 2010-01-23 10:54:19.000000000 +0300
@@ -1224,7 +1224,7 @@ static int receive_Barrier(struct drbd_c
epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
if (!epoch) {
dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
- issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
+ issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
if (issue_flush) {
rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);

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