linux-kernel - [RFC PATCH 04/16] DM: Ensure that the read request is within the device range.

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Message-Id: <1471282613-31006-5-git-send-email-linuxram@us.ibm.com>
Date:	Mon, 15 Aug 2016 10:36:41 -0700
From:	Ram Pai <linuxram@...ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-raid@...r.kernel.org,
	dm-devel@...hat.com, linux-doc@...r.kernel.org
Cc:	shli@...nel.org, agk@...hat.com, snitzer@...hat.com,
	corbet@....net, Ram Pai <linuxram@...ibm.com>
Subject: [RFC PATCH 04/16] DM: Ensure that the read request is within the device range.

If a read request is not within the device range return error.

Signed-off-by: Ram Pai <linuxram@...ibm.com>
---
 drivers/md/dm-inplace-compress.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/md/dm-inplace-compress.c b/drivers/md/dm-inplace-compress.c
index 17221a1..bf18028 100644
--- a/drivers/md/dm-inplace-compress.c
+++ b/drivers/md/dm-inplace-compress.c
@@ -1025,6 +1025,12 @@ static void dm_icomp_read_one_extent(struct dm_icomp_req *req, u64 block,
 {
 	struct dm_icomp_io_range *io;
 
+	if (block+(data_sectors>>DMCP_BLOCK_SECTOR_SHIFT) >=
+			req->info->data_blocks) {
+		req->result = -EIO;
+		return;
+	}
+
 	io = dm_icomp_create_io_range(req, data_sectors << 9,
 		logical_sectors << 9);
 	if (!io) {
@@ -1063,7 +1069,9 @@ again:
 
 	block_index = first_block_index + (logical_sectors >>
 				DMCP_BLOCK_SECTOR_SHIFT);
-	if ((block_index << DMCP_BLOCK_SECTOR_SHIFT) < bio_end_sector(req->bio))
+	if (((block_index << DMCP_BLOCK_SECTOR_SHIFT) <
+			 bio_end_sector(req->bio)) &&
+			((block_index) < req->info->data_blocks))
 		goto again;
 
 	/* A shortcut if all data is in already */
-- 
1.7.1