From 14faa944b6fa4c77a6f386806c33ce2c3c77b3a4 Mon Sep 17 00:00:00 2001
From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Wed, 18 Sep 2013 21:27:24 +0900
Subject: [PATCH] [SCSI] scsi_debug: fix buffer overrun when DIF/DIX is enabled
 and virtual_gb > 0

If the module parameter virtual_gb is greater than 0, the READ command
may request the blocks which exceed actual ramdisk storage (fake_storep).
prot_verify_read() should treat those blocks as wrap around the end of
fake_storep.  But it actually causes fake_storep and dif_storep buffer
overruns.

This fixes these buffer overruns.  In order to simplify the fix,
this also introduces fake_store() and dif_store() which return
corresponding wrap around addresses.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
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