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icmp6_notify_error uses IP6_EXTHDR_CHECK, which in turn calls

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m_pullup.  icmp6_notify_error continued to use the old pointer,
which after the m_pullup is not suitable as a packet header any
longer (see m_move_pkthdr).
and this is what causes the kernel panic in sbappendaddr later on.

PR:		kern/77934
Submitted by:	Gerd Rausch <gerd@juniper.net>
MFC after:	2 days
This commit is contained in:
Hajimu UMEMOTO 2005-02-27 18:57:10 +00:00
parent fcd2f9fe54
commit 9c0fda722d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=142681
1 changed files with 6 additions and 4 deletions
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10
sys/netinet6/icmp6.c
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@ -133,7 +133,7 @@ static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
struct ifnet **, char *));
static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
struct ifnet *, int));
static int icmp6_notify_error __P((struct mbuf *, int, int, int));
static int icmp6_notify_error __P((struct mbuf **, int, int, int));
#ifdef COMPAT_RFC1885
static struct route_in6 icmp6_reflect_rt;
@ -819,7 +819,7 @@ icmp6_input(mp, offp, proto)
break;
}
deliver:
if (icmp6_notify_error(m, off, icmp6len, code)) {
if (icmp6_notify_error(&m, off, icmp6len, code)) {
/* In this case, m should've been freed. */
return (IPPROTO_DONE);
}
@ -845,10 +845,11 @@ icmp6_input(mp, offp, proto)
}
static int
icmp6_notify_error(m, off, icmp6len, code)
struct mbuf *m;
icmp6_notify_error(mp, off, icmp6len, code)
struct mbuf **mp;
int off, icmp6len, code;
{
struct mbuf *m = *mp;
struct icmp6_hdr *icmp6;
struct ip6_hdr *eip6;
u_int32_t notifymtu;
@ -1089,6 +1090,7 @@ icmp6_notify_error(m, off, icmp6len, code)
&ip6cp);
}
}
*mp = m;
return (0);
freeit: