From: Taehee Yoo ap420073@gmail.com
[ Upstream commit f55a07074fdd38cab8c097ac5bd397d68eff733c ]
It adds missing pskb_may_pull() in amt_update_handler() and amt_multicast_data_handler(). And it fixes wrong parameter of pskb_may_pull() in amt_advertisement_handler() and amt_membership_query_handler().
Reported-by: Jakub Kicinski kuba@kernel.org Fixes: cbc21dc1cfe9 ("amt: add data plane of amt interface") Signed-off-by: Taehee Yoo ap420073@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/amt.c | 55 +++++++++++++++++++++++++++++++---------------- 1 file changed, 37 insertions(+), 18 deletions(-)
diff --git a/drivers/net/amt.c b/drivers/net/amt.c index d23eac9ce858..d8c47c4e6559 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -2220,8 +2220,7 @@ static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb) struct amt_header_advertisement *amta; int hdr_size;
- hdr_size = sizeof(*amta) - sizeof(struct amt_header); - + hdr_size = sizeof(*amta) + sizeof(struct udphdr); if (!pskb_may_pull(skb, hdr_size)) return true;
@@ -2251,19 +2250,27 @@ static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *skb) struct ethhdr *eth; struct iphdr *iph;
+ hdr_size = sizeof(*amtmd) + sizeof(struct udphdr); + if (!pskb_may_pull(skb, hdr_size)) + return true; + amtmd = (struct amt_header_mcast_data *)(udp_hdr(skb) + 1); if (amtmd->reserved || amtmd->version) return true;
- hdr_size = sizeof(*amtmd) + sizeof(struct udphdr); if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_IP), false)) return true; + skb_reset_network_header(skb); skb_push(skb, sizeof(*eth)); skb_reset_mac_header(skb); skb_pull(skb, sizeof(*eth)); eth = eth_hdr(skb); + + if (!pskb_may_pull(skb, sizeof(*iph))) + return true; iph = ip_hdr(skb); + if (iph->version == 4) { if (!ipv4_is_multicast(iph->daddr)) return true; @@ -2274,6 +2281,9 @@ static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *skb) } else if (iph->version == 6) { struct ipv6hdr *ip6h;
+ if (!pskb_may_pull(skb, sizeof(*ip6h))) + return true; + ip6h = ipv6_hdr(skb); if (!ipv6_addr_is_multicast(&ip6h->daddr)) return true; @@ -2306,8 +2316,7 @@ static bool amt_membership_query_handler(struct amt_dev *amt, struct iphdr *iph; int hdr_size, len;
- hdr_size = sizeof(*amtmq) - sizeof(struct amt_header); - + hdr_size = sizeof(*amtmq) + sizeof(struct udphdr); if (!pskb_may_pull(skb, hdr_size)) return true;
@@ -2315,22 +2324,27 @@ static bool amt_membership_query_handler(struct amt_dev *amt, if (amtmq->reserved || amtmq->version) return true;
- hdr_size = sizeof(*amtmq) + sizeof(struct udphdr) - sizeof(*eth); + hdr_size -= sizeof(*eth); if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_TEB), false)) return true; + oeth = eth_hdr(skb); skb_reset_mac_header(skb); skb_pull(skb, sizeof(*eth)); skb_reset_network_header(skb); eth = eth_hdr(skb); + if (!pskb_may_pull(skb, sizeof(*iph))) + return true; + iph = ip_hdr(skb); if (iph->version == 4) { - if (!ipv4_is_multicast(iph->daddr)) - return true; if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3))) return true;
+ if (!ipv4_is_multicast(iph->daddr)) + return true; + ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS); skb_reset_transport_header(skb); skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS); @@ -2345,15 +2359,17 @@ static bool amt_membership_query_handler(struct amt_dev *amt, ip_eth_mc_map(iph->daddr, eth->h_dest); #if IS_ENABLED(CONFIG_IPV6) } else if (iph->version == 6) { - struct ipv6hdr *ip6h = ipv6_hdr(skb); struct mld2_query *mld2q; + struct ipv6hdr *ip6h;
- if (!ipv6_addr_is_multicast(&ip6h->daddr)) - return true; if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS + sizeof(*mld2q))) return true;
+ ip6h = ipv6_hdr(skb); + if (!ipv6_addr_is_multicast(&ip6h->daddr)) + return true; + mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); skb_reset_transport_header(skb); skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); @@ -2389,23 +2405,23 @@ static bool amt_update_handler(struct amt_dev *amt, struct sk_buff *skb) { struct amt_header_membership_update *amtmu; struct amt_tunnel_list *tunnel; - struct udphdr *udph; struct ethhdr *eth; struct iphdr *iph; - int len; + int len, hdr_size;
iph = ip_hdr(skb); - udph = udp_hdr(skb);
- if (__iptunnel_pull_header(skb, sizeof(*udph), skb->protocol, - false, false)) + hdr_size = sizeof(*amtmu) + sizeof(struct udphdr); + if (!pskb_may_pull(skb, hdr_size)) return true;
- amtmu = (struct amt_header_membership_update *)skb->data; + amtmu = (struct amt_header_membership_update *)(udp_hdr(skb) + 1); if (amtmu->reserved || amtmu->version) return true;
- skb_pull(skb, sizeof(*amtmu)); + if (iptunnel_pull_header(skb, hdr_size, skb->protocol, false)) + return true; + skb_reset_network_header(skb);
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) { @@ -2426,6 +2442,9 @@ static bool amt_update_handler(struct amt_dev *amt, struct sk_buff *skb) return true;
report: + if (!pskb_may_pull(skb, sizeof(*iph))) + return true; + iph = ip_hdr(skb); if (iph->version == 4) { if (ip_mc_check_igmp(skb)) {