block/compat_ioctl: fix range check in BLKGETSIZE
authorKhazhismel Kumykov <khazhy@google.com>
Thu, 14 Apr 2022 22:40:56 +0000 (15:40 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 27 Apr 2022 11:15:31 +0000 (13:15 +0200)
commit4142a864dea06f24195a705573ebfe24601f5c92
tree4cd1de0fe811671f8cd4492a81cf0693346fea94
parent618a931c275defc1f258b93754808d59cb4c10a3
block/compat_ioctl: fix range check in BLKGETSIZE

commit ccf16413e520164eb718cf8b22a30438da80ff23 upstream.

kernel ulong and compat_ulong_t may not be same width. Use type directly
to eliminate mismatches.

This would result in truncation rather than EFBIG for 32bit mode for
large disks.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220414224056.2875681-1-khazhy@google.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
block/compat_ioctl.c