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path: root/net/bridge/br_multicast.c
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Diffstat (limited to 'net/bridge/br_multicast.c')
-rw-r--r--net/bridge/br_multicast.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 191ea66e4d92..6852f3c7009c 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1279,6 +1279,7 @@ static int br_ip4_multicast_query(struct net_bridge *br,
struct br_ip saddr;
unsigned long max_delay;
unsigned long now = jiffies;
+ unsigned int offset = skb_transport_offset(skb);
__be32 group;
int err = 0;
@@ -1289,14 +1290,14 @@ static int br_ip4_multicast_query(struct net_bridge *br,
group = ih->group;
- if (skb->len == sizeof(*ih)) {
+ if (skb->len == offset + sizeof(*ih)) {
max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
if (!max_delay) {
max_delay = 10 * HZ;
group = 0;
}
- } else if (skb->len >= sizeof(*ih3)) {
+ } else if (skb->len >= offset + sizeof(*ih3)) {
ih3 = igmpv3_query_hdr(skb);
if (ih3->nsrcs)
goto out;
@@ -1357,6 +1358,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
struct br_ip saddr;
unsigned long max_delay;
unsigned long now = jiffies;
+ unsigned int offset = skb_transport_offset(skb);
const struct in6_addr *group = NULL;
bool is_general_query;
int err = 0;
@@ -1366,8 +1368,8 @@ static int br_ip6_multicast_query(struct net_bridge *br,
(port && port->state == BR_STATE_DISABLED))
goto out;
- if (skb->len == sizeof(*mld)) {
- if (!pskb_may_pull(skb, sizeof(*mld))) {
+ if (skb->len == offset + sizeof(*mld)) {
+ if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
err = -EINVAL;
goto out;
}
@@ -1376,7 +1378,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
if (max_delay)
group = &mld->mld_mca;
} else {
- if (!pskb_may_pull(skb, sizeof(*mld2q))) {
+ if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
err = -EINVAL;
goto out;
}