[Xen-devel] [PATCH] Linux: blktap2: Fwd: Fix wild ptr deref during device destruction.

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

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;

Attachment: blktap2-wild-ptr-deref.patch
Description: Text document

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