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authorMikulas Patocka <mpatocka@redhat.com>2017-09-13 09:17:57 -0400
committerJens Axboe <axboe@kernel.dk>2017-09-25 08:56:05 -0600
commit02a4843618fb35f847cf8c31cd3893873aa0edde (patch)
tree07a8caec8d3ab5e68f42026f9bea8cad31a968ce /block
parentMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi (diff)
downloadlinux-dev-02a4843618fb35f847cf8c31cd3893873aa0edde.tar.xz
linux-dev-02a4843618fb35f847cf8c31cd3893873aa0edde.zip
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>
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