From ef8c4423d8faf324a4a58a7d1d16114d183c7f27 Mon Sep 17 00:00:00 2001
From: Robert Breker <robert.breker@citrix.com>
Date: Sun, 4 Oct 2015 23:07:55 +0000
Subject: [PATCH] Prevent discard requests from going beyond the disk size (to
 be squashed)

Signed-off-by: Robert Breker <robert.breker@citrix.com>
---
 drivers/tapdisk-image.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tapdisk-image.c b/drivers/tapdisk-image.c
index eac7cdd1..b9732037 100644
--- a/drivers/tapdisk-image.c
+++ b/drivers/tapdisk-image.c
@@ -143,6 +143,7 @@ tapdisk_image_check_request(td_image_t *image, td_vbd_request_t *vreq)
 
 	switch (vreq->op) {
 	case TD_OP_DISCARD:
+                secs = vreq->discard_nr_sectors;
 		/* fall through */
 	case TD_OP_WRITE:
 		if (rdonly) {