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m_prepend does not tolerate being given len > MHLEN, so add a panic, and 

document this behavior.
This commit is contained in:
maxv 2018-01-22 10:26:38 +00:00
parent 35c7659d33
commit 5c9e30189d
2 changed files with 12 additions and 4 deletions
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8
share/man/man9/mbuf.9
View File

@ -1,4 +1,4 @@
.\" $NetBSD: mbuf.9,v 1.53 2018/01/01 12:46:49 wiz Exp $
.\" $NetBSD: mbuf.9,v 1.54 2018/01/22 10:26:38 maxv Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd January 1, 2018
.Dd January 22, 2018
.Dt MBUF 9
.Os
.Sh NAME
@ -431,6 +431,10 @@ The
parameter is a choice of
.Dv M_WAIT / M_DONTWAIT
from caller.
It is illegal for the
.Fa len
parameter to be greater than
.Dv MHLEN .
.It Fn m_pulldown "struct mbuf *m" "int off" "int len" "int *offp"
Rearranges an mbuf chain so that
.Fa len

8
sys/kern/uipc_mbuf.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uipc_mbuf.c,v 1.179 2018/01/22 09:06:40 maxv Exp $ */
/* $NetBSD: uipc_mbuf.c,v 1.180 2018/01/22 10:26:38 maxv Exp $ */
/*
* Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
@ -62,7 +62,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.179 2018/01/22 09:06:40 maxv Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.180 2018/01/22 10:26:38 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_mbuftrace.h"
@ -661,6 +661,10 @@ m_prepend(struct mbuf *m, int len, int how)
{
struct mbuf *mn;
if (__predict_false(len > MHLEN)) {
panic("%s: len > MHLEN", __func__);
}
KASSERT(len != M_COPYALL);
mn = m_get(how, m->m_type);
if (mn == NULL) {