From ccf98fe9312539aca1154a9462d611d8fdc4f5fa Mon Sep 17 00:00:00 2001
From: CTurt <CTurt@users.noreply.github.com>
Date: Sat, 30 Jan 2016 10:05:23 +0000
Subject: [PATCH] HBSD: Additional copyin check

Signed-off-by: CTurt <cturt@hardenedbsd.org>
---
 sys/dev/tdfx/tdfx_pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/dev/tdfx/tdfx_pci.c b/sys/dev/tdfx/tdfx_pci.c
index 0d50af633fe8..b80c2fbede32 100644
--- a/sys/dev/tdfx/tdfx_pci.c
+++ b/sys/dev/tdfx/tdfx_pci.c
@@ -710,7 +710,8 @@ tdfx_do_pio_wt(struct tdfx_pio_data *piod)
 	}
 
 	/* Write the data to the intended port */
-	copyin(piod->value, &ret_byte, sizeof(u_int8_t));
+	if (copyin(piod->value, &ret_byte, sizeof(u_int8_t)))
+		return -EFAULT;
 	workport = piod->port;
 	outb(workport, ret_byte);
 	return 0;