From: Eric Dumazet <edumazet@google.com>
To: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>, Ido Schimmel <idosch@nvidia.com>,
Andrew Lunn <andrew+netdev@lunn.ch>,
netdev@vger.kernel.org, eric.dumazet@gmail.com,
Eric Dumazet <edumazet@google.com>,
stable@vger.kernel.org
Subject: [PATCH net 5/5] vxlan: use pskb_network_may_pull() for transmit path header pulls
Date: Thu, 23 Jul 2026 14:42:49 +0000 [thread overview]
Message-ID: <20260723144249.759100-6-edumazet@google.com> (raw)
In-Reply-To: <20260723144249.759100-1-edumazet@google.com>
In vxlan_xmit(), arp_reduce(), and vxlan_mdb_entry_skb_get(), pskb_may_pull() was
being called to verify the availability of network layer headers (ARP, IPv6/ND,
IP/IPv6 MDB keys).
However, during transmit skb->data points to the MAC header, so skb_network_offset(skb)
is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, len) only checks len bytes from skb->data
rather than skb_network_offset(skb) + len, which can leave part of the network header
in non-linear frags.
Replace these remaining pskb_may_pull() calls with pskb_network_may_pull() to properly
account for the MAC header offset.
Fixes: 465016142711 ("vxlan: Add ARP reduction support")
Fixes: 9e061a50a116 ("vxlan: Add IPv6 Neighbor Discovery reduction support")
Fixes: 4e94f09d84bf ("vxlan: add MDB support")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: stable@vger.kernel.org
---
drivers/net/vxlan/vxlan_core.c | 6 +++---
drivers/net/vxlan/vxlan_mdb.c | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 9ccbebda860480f8378918ff360deee1c46f3f7d..eff17987c5b531ecb1e2943b6274d20c1827d299 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1850,7 +1850,7 @@ static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
if (dev->flags & IFF_NOARP)
goto out;
- if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
+ if (!pskb_network_may_pull(skb, arp_hdr_len(dev))) {
dev_dstats_tx_dropped(dev);
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_TX_DROPS, 0);
@@ -2763,8 +2763,8 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
return arp_reduce(dev, skb, vni);
#if IS_ENABLED(CONFIG_IPV6)
else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
- pskb_may_pull(skb, sizeof(struct ipv6hdr) +
- sizeof(struct nd_msg)) &&
+ pskb_network_may_pull(skb, sizeof(struct ipv6hdr) +
+ sizeof(struct nd_msg)) &&
ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
diff --git a/drivers/net/vxlan/vxlan_mdb.c b/drivers/net/vxlan/vxlan_mdb.c
index af7a0d7f95a57a17486a8ecc277b7bb9d921a061..9a9038ae90c18c5f0e4362b2b254b0c48dfdad0e 100644
--- a/drivers/net/vxlan/vxlan_mdb.c
+++ b/drivers/net/vxlan/vxlan_mdb.c
@@ -1631,7 +1631,7 @@ struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan,
switch (skb->protocol) {
case htons(ETH_P_IP):
- if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
return NULL;
group.dst.sa.sa_family = AF_INET;
group.dst.sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
@@ -1640,7 +1640,7 @@ struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan,
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
- if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
return NULL;
group.dst.sa.sa_family = AF_INET6;
group.dst.sin6.sin6_addr = ipv6_hdr(skb)->daddr;
--
2.55.0.229.g6434b31f56-goog
next prev parent reply other threads:[~2026-07-23 14:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260723144249.759100-1-edumazet@google.com>
2026-07-23 14:42 ` [PATCH net 1/5] vxlan: re-fetch eth header after route_shortcircuit() Eric Dumazet
2026-07-23 16:37 ` Vadim Fedorenko
2026-07-23 14:42 ` [PATCH net 2/5] vxlan: unclone skb head before modifying eth header in route_shortcircuit() Eric Dumazet
2026-07-23 14:42 ` [PATCH net 3/5] vxlan: use neigh_ha_snapshot() " Eric Dumazet
2026-07-23 16:41 ` Vadim Fedorenko
2026-07-23 14:42 ` [PATCH net 4/5] vxlan: use pskb_network_may_pull() " Eric Dumazet
2026-07-23 16:42 ` Vadim Fedorenko
2026-07-23 14:42 ` Eric Dumazet [this message]
2026-07-23 16:43 ` [PATCH net 5/5] vxlan: use pskb_network_may_pull() for transmit path header pulls Vadim Fedorenko
2026-07-26 10:34 ` Ido Schimmel
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