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[Xen-devel] [PATCH] Linux: blktap2: Fwd: Fix wild ptr deref during devic
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] Linux: blktap2: Fwd: Fix wild ptr deref during device destruction. |
| From: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
| Date: | Mon, 01 Mar 2010 09:17:33 +0000 |
| Cc: | Daniel Stodden <daniel.stodden@xxxxxxxxxx> |
| Delivery-date: | Mon, 01 Mar 2010 01:18:02 -0800 |
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A put_disk() before blk_cleanup_queue() would free gd before gd->queue
is read.
Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- a/drivers/xen/blktap2/device.c
+++ b/drivers/xen/blktap2/device.c
@@ -1077,8 +1077,8 @@
#endif
del_gendisk(dev->gd);
+ blk_cleanup_queue(dev->gd->queue);
put_disk(dev->gd);
- blk_cleanup_queue(dev->gd->queue);
dev->gd = NULL;
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