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Date: Fri, 22 Mar 2019 12:16:37 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, NeilBrown <neil@...wn.name>, Mike Snitzer <snitzer@...hat.com>, Guillaume Perréal <gperreal@...e.fr> Subject: [PATCH 5.0 178/238] dm: fix to_sector() for 32bit 5.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: NeilBrown <neil@...wn.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@...r.kernel.org (v4.2+) Reported-and-tested-by: Guillaume Perréal <gperreal@...e.fr> Signed-off-by: NeilBrown <neil@...wn.name> Signed-off-by: Mike Snitzer <snitzer@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 @@ -609,7 +609,7 @@ do { \ */ #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); }
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