From ea4313e351cbb34c329f351438f161a6fd7db917 Mon Sep 17 00:00:00 2001
From: "Andrey A. Chernov" <ache@FreeBSD.org>
Date: Thu, 23 Aug 2001 16:06:14 +0000
Subject: [PATCH] Copy my newly introduced l_len<0 'oops' fix from kern_lockf.c

---
 sys/fs/smbfs/smbfs_vnops.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/fs/smbfs/smbfs_vnops.c b/sys/fs/smbfs/smbfs_vnops.c
index bc2a5c337a0..286832f112c 100644
--- a/sys/fs/smbfs/smbfs_vnops.c
+++ b/sys/fs/smbfs/smbfs_vnops.c
@@ -1008,10 +1008,12 @@ smbfs_advlock(ap)
 	if (start < 0)
 		return EINVAL;
 	if (fl->l_len < 0) {
-		start += fl->l_len;
-		if (start <= 0)
+		if (start == 0)
 			return EINVAL;
 		end = start - 1;
+		start += fl->l_len;
+		if (start < 0)
+			return EINVAL;
 	} else if (fl->l_len == 0)
 		end = -1;
 	else {