From 2fa6d2fe8429a0bdcead3f328e95f3158f30244d Mon Sep 17 00:00:00 2001
From: Dmitry Chagin <dchagin@FreeBSD.org>
Date: Sun, 26 Feb 2017 20:01:58 +0000
Subject: [PATCH] Return EINVAL in case when an invalid size of signal mask
 specified.

MFC after:	1 month
---
 sys/compat/linux/linux_event.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/compat/linux/linux_event.c b/sys/compat/linux/linux_event.c
index 967fadb045f..f7471b223f3 100644
--- a/sys/compat/linux/linux_event.c
+++ b/sys/compat/linux/linux_event.c
@@ -622,6 +622,8 @@ linux_epoll_pwait(struct thread *td, struct linux_epoll_pwait_args *args)
 	int error;
 
 	if (args->mask != NULL) {
+		if (args->sigsetsize != sizeof(l_sigset_t))
+			return (EINVAL);
 		error = copyin(args->mask, &lmask, sizeof(l_sigset_t));
 		if (error != 0)
 			return (error);