linux-kernel - [PATCH 75/75] zram: allow request end to coincide with disksize

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Message-Id: <1376476624-10011-76-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 14 Aug 2013 11:37:04 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Backlund <tmb@...eia.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 75/75] zram: allow request end to coincide with disksize

3.5.7.19 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

commit 75c7caf5a052ffd8db3312fa7864ee2d142890c4 upstream.

Pass valid_io_request() checks if request end coincides with disksize
(end equals bound), only fail if we attempt to read beyond the bound.

mkfs.ext2 produces numerous errors:
[ 2164.632747] quiet_error: 1 callbacks suppressed
[ 2164.633260] Buffer I/O error on device zram0, logical block 153599
[ 2164.633265] lost page write due to I/O error on zram0

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Thomas Backlund <tmb@...eia.org>
[ luis: backported to 3.5: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/staging/zram/zram_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 1ae0610..2e88a68 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -545,7 +545,7 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio)
 	end = start + (bio->bi_size >> SECTOR_SHIFT);
 	bound = zram->disksize >> SECTOR_SHIFT;
 	/* out of range range */
-	if (unlikely(start >= bound || end >= bound || start > end))
+	if (unlikely(start >= bound || end > bound || start > end))
 		return 0;
 
 	/* I/O request is valid */
-- 
1.8.3.2

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