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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, NeilBrown <neil@brown.name>,
        Mike Snitzer <snitzer@redhat.com>,
        =?UTF-8?q?Guillaume=20Perr=C3=A9al?= <gperreal@free.fr>
Subject: [PATCH 4.9 100/118] dm: fix to_sector() for 32bit
Date:   Fri, 22 Mar 2019 12:16:12 +0100
Message-Id: <20190322111223.448545636@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: NeilBrown <neil@brown.name>

commit 0bdb50c531f7377a9da80d3ce2d61f389c84cb30 upstream.

A dm-raid array with devices larger than 4GB won't assemble on
a 32 bit host since _check_data_dev_sectors() was added in 4.16.
This is because to_sector() treats its argument as an "unsigned long"
which is 32bits (4GB) on a 32bit host.  Using "unsigned long long"
is more correct.

Kernels as early as 4.2 can have other problems due to to_sector()
being used on the size of a device.

Fixes: 0cf4503174c1 ("dm raid: add support for the MD RAID0 personality")
cc: stable@vger.kernel.org (v4.2+)
Reported-and-tested-by: Guillaume Perréal <gperreal@free.fr>
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/device-mapper.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -627,7 +627,7 @@ extern struct ratelimit_state dm_ratelim
  */
 #define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
 
-static inline sector_t to_sector(unsigned long n)
+static inline sector_t to_sector(unsigned long long n)
 {
 	return (n >> SECTOR_SHIFT);
 }