diff --git a/ipc/shm.c b/ipc/shm.c
index 867e5d6..0c3debb 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -752,9 +752,10 @@
 			goto out_unlock;
 
 		if (!capable(CAP_IPC_LOCK)) {
+			uid_t euid = current_euid();
 			err = -EPERM;
-			if (current->euid != shp->shm_perm.uid &&
-			    current->euid != shp->shm_perm.cuid)
+			if (euid != shp->shm_perm.uid &&
+			    euid != shp->shm_perm.cuid)
 				goto out_unlock;
 			if (cmd == SHM_LOCK &&
 			    !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)