diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2017-09-13 09:17:57 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-09-25 08:56:05 -0600 |
| commit | 02a4843618fb35f847cf8c31cd3893873aa0edde (patch) | |
| tree | 07a8caec8d3ab5e68f42026f9bea8cad31a968ce /block/bsg-lib.c | |
| parent | 820bf5c419e4b85298e5c3001bd1b5be46d60765 (diff) | |
brd: fix overflow in __brd_direct_access
The code in __brd_direct_access multiplies the pgoff variable by page size
and divides it by 512. It can cause overflow on 32-bit architectures. The
overflow happens if we create ramdisk larger than 4G and use it as a
sparse device.
This patch replaces multiplication and division with multiplication by the
number of sectors per page.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 1647b9b959c7 ("brd: add dax_operations support")
Cc: stable@vger.kernel.org # 4.12+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bsg-lib.c')
0 files changed, 0 insertions, 0 deletions