[PATCH] xen_disk: fix memory leak

[Matthew Daley <mattd@bugfuzz.com>]

On ioreq_release the full ioreq was memset to 0, loosing all the data
and memory allocations inside the QEMUIOVector, which leads to a
memory leak. Create a new function to specifically reset ioreq.

Reported-by: Maik Wessler <maik.wessler@yahoo.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Backport to qemu-xen-traditional.

Signed-off-by: Matthew Daley <mattd@bugfuzz.com>
---
 hw/xen_disk.c |   26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index ee8d36f..250d806 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -116,6 +116,29 @@ struct XenBlkDev {
 
 /* ------------------------------------------------------------- */
 
+static void ioreq_reset(struct ioreq *ioreq)
+{
+    memset(&ioreq->req, 0, sizeof(ioreq->req));
+    ioreq->status = 0;
+    ioreq->start = 0;
+    ioreq->presync = 0;
+    ioreq->postsync = 0;
+
+    memset(ioreq->domids, 0, sizeof(ioreq->domids));
+    memset(ioreq->refs, 0, sizeof(ioreq->refs));
+    ioreq->prot = 0;
+    memset(ioreq->page, 0, sizeof(ioreq->page));
+    ioreq->pages = NULL;
+
+    ioreq->aio_inflight = 0;
+    ioreq->aio_errors = 0;
+
+    ioreq->blkdev = NULL;
+    memset(&ioreq->list, 0, sizeof(ioreq->list));
+
+    qemu_iovec_reset(&ioreq->v);
+}
+
 static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
 {
     struct ioreq *ioreq = NULL;
@@ -132,7 +155,6 @@ static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
 	/* get one from freelist */
 	ioreq = LIST_FIRST(&blkdev->freelist);
 	LIST_REMOVE(ioreq, list);
-        qemu_iovec_reset(&ioreq->v);
     }
     LIST_INSERT_HEAD(&blkdev->inflight, ioreq, list);
     blkdev->requests_inflight++;
@@ -156,7 +178,7 @@ static void ioreq_release(struct ioreq *ioreq, bool finish)
     struct XenBlkDev *blkdev = ioreq->blkdev;
 
     LIST_REMOVE(ioreq, list);
-    memset(ioreq, 0, sizeof(*ioreq));
+    ioreq_reset(ioreq);
     ioreq->blkdev = blkdev;
     LIST_INSERT_HEAD(&blkdev->freelist, ioreq, list);
     if (finish) {
-- 
1.7.10.4


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