From: Khazhismel Kumykov <khazhy@xxxxxxxxxx> 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@xxxxxxx> Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx> Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220414224056.2875681-1-khazhy@xxxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/compat_ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -391,7 +391,7 @@ long compat_blkdev_ioctl(struct file *fi return 0; 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(arg, size >> 9);
