diff options
Diffstat (limited to 'sys/netinet6')
-rw-r--r-- | sys/netinet6/ip6_output.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c index 6045ee1e185b..49b89564b978 100644 --- a/sys/netinet6/ip6_output.c +++ b/sys/netinet6/ip6_output.c @@ -1393,6 +1393,15 @@ ip6_ctloutput(struct socket *so, struct sockopt *sopt) int retval; #endif +/* + * Don't use more than a quarter of mbuf clusters. N.B.: + * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow + * on LP64 architectures, so cast to u_long to avoid undefined + * behavior. ILP32 architectures cannot have nmbclusters + * large enough to overflow for other reasons. + */ +#define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4) + level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; @@ -1448,6 +1457,12 @@ ip6_ctloutput(struct socket *so, struct sockopt *sopt) { struct mbuf *m; + if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) { + printf("ip6_ctloutput: mbuf limit hit\n"); + error = ENOBUFS; + break; + } + error = soopt_getm(sopt, &m); /* XXX */ if (error != 0) break; |