diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 9996b6e84585415f504de9ebab7bbcbfa742cc66..5f68b220c26d6c806dc1ccc6ad323c0c69d30d79 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -230,6 +230,9 @@ sysn32_waitid(int which, compat_pid_t pid,
 	long ret;
 	mm_segment_t old_fs = get_fs();
 
+	if (!access_ok(VERIFY_WRITE, uinfo, sizeof(*uinfo)))
+		return -EFAULT;
+
 	set_fs (KERNEL_DS);
 	ret = sys_waitid(which, pid, uinfo, options,
 			 uru ? (struct rusage __user *) &ru : NULL);