loader/libofw: Fix disk size truncation

At present OF_ioctl first multiplies, then casts to 64-bit, meaning at
the asm level it truncates the result to 32-bit, then zero-extends it to
64-bit to return.  Cast `n` to 64-bit before multiplying, so that the
correct result is returned.

(cherry picked from commit cd6e526e268e4fdf1c9a65b9d792e67343f52307)

1 files changed, 1 insertions, 1 deletions

diff --git a/stand/libofw/ofw_disk.c b/stand/libofw/ofw_disk.c
index e9002ca23fe9..d30454b70b74 100644
--- a/stand/libofw/ofw_disk.c
+++ b/stand/libofw/ofw_disk.c
@@ -174,7 +174,7 @@ ofwd_ioctl(struct open_file *f, u_long cmd, void *data)
 	case DIOCGMEDIASIZE:
 		block_size = OF_block_size(dev->d_handle);
 		n = OF_blocks(dev->d_handle);
-		*(uint64_t *)data = (uint64_t)(n * block_size);
+		*(uint64_t *)data = ((uint64_t)n * block_size);
 		break;
 	default:
 		return (ENOTTY);