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authorYan Zheng <yanzheng@21cn.com>2005-10-31 20:09:45 +0800
committerArnaldo Carvalho de Melo <acme@mandriva.com>2005-10-31 22:52:03 -0200
commit97300b5fdfe28c6edae926926f9467a27cf5889c (patch)
tree5a28ee8ff8fbddb44ed3f8b5e3d37c0439af1608 /net/ipv6/mcast.c
parentedc9e81917157d1e73bf081d4fbcad7c34d32783 (diff)
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[MCAST] IPv6: Check packet size when process Multicast
Signed-off-by: Yan Zheng <yanzheng@21cn.com Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net/ipv6/mcast.c')
-rw-r--r--net/ipv6/mcast.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index c4f2a0ef7489..966b2372aaab 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1087,7 +1087,7 @@ static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
int igmp6_event_query(struct sk_buff *skb)
{
- struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
+ struct mld2_query *mlh2 = NULL;
struct ifmcaddr6 *ma;
struct in6_addr *group;
unsigned long max_delay;
@@ -1140,6 +1140,13 @@ int igmp6_event_query(struct sk_buff *skb)
/* clear deleted report items */
mld_clear_delrec(idev);
} else if (len >= 28) {
+ int srcs_offset = sizeof(struct mld2_query) -
+ sizeof(struct icmp6hdr);
+ if (!pskb_may_pull(skb, srcs_offset)) {
+ in6_dev_put(idev);
+ return -EINVAL;
+ }
+ mlh2 = (struct mld2_query *) skb->h.raw;
max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
if (!max_delay)
max_delay = 1;
@@ -1156,7 +1163,15 @@ int igmp6_event_query(struct sk_buff *skb)
return 0;
}
/* mark sources to include, if group & source-specific */
- mark = mlh2->nsrcs != 0;
+ if (mlh2->nsrcs != 0) {
+ if (!pskb_may_pull(skb, srcs_offset +
+ mlh2->nsrcs * sizeof(struct in6_addr))) {
+ in6_dev_put(idev);
+ return -EINVAL;
+ }
+ mlh2 = (struct mld2_query *) skb->h.raw;
+ mark = 1;
+ }
} else {
in6_dev_put(idev);
return -EINVAL;