Module Name: src
Committed By: mlelstv
Date: Sun Feb 8 14:46:30 UTC 2015
Modified Files:
src/sys/kern: uipc_mbuf.c
Log Message:
Correct m_len calculation for m_dup() with mbuf clusters.
Fixes kern/49650.
To generate a diff of this commit:
cvs rdiff -u -r1.160 -r1.161 src/sys/kern/uipc_mbuf.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/uipc_mbuf.c
diff -u src/sys/kern/uipc_mbuf.c:1.160 src/sys/kern/uipc_mbuf.c:1.161
--- src/sys/kern/uipc_mbuf.c:1.160 Tue Dec 2 04:43:35 2014
+++ src/sys/kern/uipc_mbuf.c Sun Feb 8 14:46:30 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: uipc_mbuf.c,v 1.160 2014/12/02 04:43:35 ozaki-r Exp $ */
+/* $NetBSD: uipc_mbuf.c,v 1.161 2015/02/08 14:46:30 mlelstv 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 1.160 2014/12/02 04:43:35 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.161 2015/02/08 14:46:30 mlelstv Exp $");
#include "opt_mbuftrace.h"
#include "opt_nmbclusters.h"
@@ -777,8 +777,13 @@ m_copym0(struct mbuf *m, int off0, int l
/*
* we are unsure about the way m was allocated.
* copy into multiple MCLBYTES cluster mbufs.
+ *
+ * recompute m_len, it is no longer valid if MCLGET()
+ * fails to allocate a cluster. Then we try to split
+ * the source into normal sized mbufs.
*/
MCLGET(n, wait);
+ n->m_len = 0;
n->m_len = M_TRAILINGSPACE(n);
n->m_len = m_copylen(len, n->m_len);
n->m_len = min(n->m_len, m->m_len - off);
