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 12:40:54 +0000 (14:40 +0200)
commit3341481bf2bba2b3cb07de48e33c0ef778fb362c
tree27382545e88635f582ca641522e99ce85c9c1eb7
parent29186fd45d7b1eb5e775b256b96c179b0626c75d
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/ioctl.c