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Diffstat (limited to 'net/bridge/br_multicast.c')
-rw-r--r--net/bridge/br_multicast.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index f19e347f56f6..543b3262d002 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1430,7 +1430,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
- struct sk_buff *skb2 = skb;
+ struct sk_buff *skb2;
struct ipv6hdr *ip6h;
struct icmp6hdr *icmp6h;
u8 nexthdr;
@@ -1469,15 +1469,15 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
if (!skb2)
return -ENOMEM;
+ err = -EINVAL;
+ if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
+ goto out;
+
len -= offset - skb_network_offset(skb2);
__skb_pull(skb2, offset);
skb_reset_transport_header(skb2);
- err = -EINVAL;
- if (!pskb_may_pull(skb2, sizeof(*icmp6h)))
- goto out;
-
icmp6h = icmp6_hdr(skb2);
switch (icmp6h->icmp6_type) {
@@ -1516,7 +1516,12 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
switch (icmp6h->icmp6_type) {
case ICMPV6_MGM_REPORT:
{
- struct mld_msg *mld = (struct mld_msg *)icmp6h;
+ struct mld_msg *mld;
+ if (!pskb_may_pull(skb2, sizeof(*mld))) {
+ err = -EINVAL;
+ goto out;
+ }
+ mld = (struct mld_msg *)skb_transport_header(skb2);
BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
break;
@@ -1529,15 +1534,18 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
break;
case ICMPV6_MGM_REDUCTION:
{
- struct mld_msg *mld = (struct mld_msg *)icmp6h;
+ struct mld_msg *mld;
+ if (!pskb_may_pull(skb2, sizeof(*mld))) {
+ err = -EINVAL;
+ goto out;
+ }
+ mld = (struct mld_msg *)skb_transport_header(skb2);
br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
}
}
out:
- __skb_push(skb2, offset);
- if (skb2 != skb)
- kfree_skb(skb2);
+ kfree_skb(skb2);
return err;
}
#endif