Author: markj
Date: Tue Dec 1 03:07:26 2020
New Revision: 368202
URL: https://svnweb.freebsd.org/changeset/base/368202
Log:
MFC r367114 (by melifaro):
Fix use-after-free in icmp6_notify_error().
Modified:
stable/11/sys/netinet6/icmp6.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/netinet6/icmp6.c
==============================================================================
--- stable/11/sys/netinet6/icmp6.c Mon Nov 30 22:35:30 2020
(r368201)
+++ stable/11/sys/netinet6/icmp6.c Tue Dec 1 03:07:26 2020
(r368202)
@@ -903,6 +903,7 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp
}
#endif
eip6 = (struct ip6_hdr *)(icmp6 + 1);
+ bzero(&icmp6dst, sizeof(icmp6dst));
/* Detect the upper level protocol */
{
@@ -911,7 +912,6 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp
int eoff = off + sizeof(struct icmp6_hdr) +
sizeof(struct ip6_hdr);
struct ip6ctlparam ip6cp;
- struct in6_addr *finaldst = NULL;
int icmp6type = icmp6->icmp6_type;
struct ip6_frag *fh;
struct ip6_rthdr *rth;
@@ -994,7 +994,7 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp
/* just ignore a bogus header */
if ((rth0->ip6r0_len % 2) == 0 &&
(hops = rth0->ip6r0_len/2))
- finaldst = (struct in6_addr
*)(rth0 + 1) + (hops - 1);
+ icmp6dst.sin6_addr = *((struct
in6_addr *)(rth0 + 1) + (hops - 1));
}
eoff += rthlen;
nxt = rth->ip6r_nxt;
@@ -1059,13 +1059,10 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp
*/
eip6 = (struct ip6_hdr *)(icmp6 + 1);
- bzero(&icmp6dst, sizeof(icmp6dst));
icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
icmp6dst.sin6_family = AF_INET6;
- if (finaldst == NULL)
+ if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr))
icmp6dst.sin6_addr = eip6->ip6_dst;
- else
- icmp6dst.sin6_addr = *finaldst;
if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
goto freeit;
bzero(&icmp6src, sizeof(icmp6src));
@@ -1077,13 +1074,11 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp
icmp6src.sin6_flowinfo =
(eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
- if (finaldst == NULL)
- finaldst = &eip6->ip6_dst;
ip6cp.ip6c_m = m;
ip6cp.ip6c_icmp6 = icmp6;
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
ip6cp.ip6c_off = eoff;
- ip6cp.ip6c_finaldst = finaldst;
+ ip6cp.ip6c_finaldst = &icmp6dst.sin6_addr;
ip6cp.ip6c_src = &icmp6src;
ip6cp.ip6c_nxt = nxt;
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