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block/compat_ioctl: fix range check in BLKGETSIZE

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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>
This commit is contained in:
Khazhismel Kumykov 2022-04-14 15:40:56 -07:00 committed by Greg Kroah-Hartman
parent 27da8d16e4
commit c028b81d06
1 changed files with 1 additions and 1 deletions
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2
block/compat_ioctl.c
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@ -393,7 +393,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
return 0; return 0;
case BLKGETSIZE: case BLKGETSIZE:
size = i_size_read(bdev->bd_inode); size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL) if ((size >> 9) > ~(compat_ulong_t)0)
return -EFBIG; return -EFBIG;
return compat_put_ulong(arg, size >> 9); return compat_put_ulong(arg, size >> 9);