Index: head/sys/kern/uipc_syscalls.c
===================================================================
--- head/sys/kern/uipc_syscalls.c
+++ head/sys/kern/uipc_syscalls.c
@@ -2108,6 +2108,7 @@
 			goto out;
 		}
 	} else if (fp->f_type == DTYPE_SHM) {
+		error = 0;
 		shmfd = fp->f_data;
 		obj = shmfd->shm_object;
 		*obj_size = shmfd->shm_size;