linux-kernel - [PATCH 8/11] rsxx: Adapter address space sanity check.

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Message-ID: <20130618194837.GI6492@oc6784271780.ibm.com>
Date:	Tue, 18 Jun 2013 14:48:38 -0500
From:	"Philip J. Kelleher" <pjk1939@...ux.vnet.ibm.com>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, brking@...ux.vnet.ibm.com
Subject: [PATCH 8/11] rsxx: Adapter address space sanity check.

From: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>

Adding a sanity check to guarentee that DMAs outside of the device's
address space will be errored out right away.

Signed-off-by: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
-------------------------------------------------------------------------------


diff -uprN -X linux-block-vanilla/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/dev.c linux-block/drivers/block/rsxx/dev.c
--- linux-block-vanilla/drivers/block/rsxx/dev.c	2013-06-18 09:39:43.154903231 -0500
+++ linux-block/drivers/block/rsxx/dev.c	2013-06-18 09:44:02.210841168 -0500
@@ -174,6 +174,9 @@ static void rsxx_make_request(struct req
 	if (!card)
 		goto req_err;
 
+	if (bio->bi_sector + (bio->bi_size >> 9) > get_capacity(card->gendisk))
+		goto req_err;
+
 	if (unlikely(card->halt)) {
 		st = -EFAULT;
 		goto req_err;

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