From: Khazhismel Kumykov khazhy@google.com
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 | 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);