diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index effc3a0881..e24f43c4a2 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -10502,7 +10502,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                     ret = arg2;
                 }
 
-                ret = host_to_target_cpu_mask(mask, mask_size, arg3, arg2);
+                if (host_to_target_cpu_mask(mask, mask_size, arg3, ret)) {
+                    goto efault;
+                }
             }
         }
         break;