--- src/sys/emulation/linux/linux_file.c	2005/08/27 20:23:05	1.24
+++ src/sys/emulation/linux/linux_file.c	2006/04/26 17:42:52	1.25
@@ -817,8 +817,10 @@ linux_pread(struct linux_pread_args *uap
 	auio.uio_segflg = UIO_USERSPACE;
 	auio.uio_td = td;
 
-	error = kern_readv(uap->fd, &auio, FOF_OFFSET, &uap->sysmsg_result);
-
+	if (auio.uio_resid < 0)
+		error = EINVAL;
+	else
+		error = kern_readv(uap->fd, &auio, FOF_OFFSET, &uap->sysmsg_result);
 	return(error);
 }
 
@@ -840,7 +842,10 @@ linux_pwrite(struct linux_pwrite_args *u
         auio.uio_segflg = UIO_USERSPACE;
         auio.uio_td = td;
 
-	error = kern_writev(uap->fd, &auio, FOF_OFFSET, &uap->sysmsg_result);
+	if (auio.uio_resid < 0)
+		error = EINVAL;
+	else
+		error = kern_writev(uap->fd, &auio, FOF_OFFSET, &uap->sysmsg_result);
 
 	return(error);
 }