From 4ca7c740a6fdad925acf1dd67eefa6e5a4dd8b74 Mon Sep 17 00:00:00 2001
From: Sheldon Hearn <sheldonh@FreeBSD.org>
Date: Sun, 20 Feb 2000 09:08:33 +0000
Subject: [PATCH] Fix buffer overrun in pcfclock_read().  The submitter is the
 original author of the affected code.

PR:		16552
Submitted by:	Sascha Schumann <sascha@schumann.cx>
Approved by:	jkh
---
 sys/dev/ppbus/pcfclock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/dev/ppbus/pcfclock.c b/sys/dev/ppbus/pcfclock.c
index a52ff82420d..9101638d83f 100644
--- a/sys/dev/ppbus/pcfclock.c
+++ b/sys/dev/ppbus/pcfclock.c
@@ -312,6 +312,9 @@ pcfclock_read(dev_t dev, struct uio *uio, int ioflag)
 	char buf[18];
 	int error = 0;
 
+	if (uio->uio_resid < 18)
+		return (ERANGE);
+
 	error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
 	
 	if (error) {