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block/compat_ioctl: fix range check in BLKGETSIZE

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commit ccf16413e5 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 fea24b07ed
commit 8bedbc8f7f
1 changed files with 1 additions and 1 deletions
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block/ioctl.c
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@@ -679,7 +679,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
case BLKGETSIZE:
size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL)
if ((size >> 9) > ~(compat_ulong_t)0)
return -EFBIG;
return compat_put_ulong(argp, size >> 9);