Prevent seeking to negative offsets when seeking from the end of a file;

noticed by Tim Newsham <newsham@aloha.net>

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 4ebf43c..1148201 100644 (file)
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: vfs_syscalls.c,v 1.20 1997/01/26 05:18:29 downsj Exp $        */
+/*     $OpenBSD: vfs_syscalls.c,v 1.21 1997/02/02 00:32:02 tholo Exp $ */
 /*     $NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $        */
 
 /*
@@ -1167,7 +1167,7 @@ sys_lseek(p, v, retval)
                                    cred, p);
                if (error)
                        return (error);
-               if (vattr.va_size + SCARG(uap, offset) < 0)
+               if ((off_t)vattr.va_size + SCARG(uap, offset) < 0)
                        return (EINVAL);
                fp->f_offset = SCARG(uap, offset) + vattr.va_size;
                break;