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linux/drivers/net/vxlan
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Eric Dumazet 7d9ef0cb27 vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() 
skb_tunnel_check_pmtu() can change skb->head.

Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF.

Use instead ip_hdr(skb) as done in drivers/net/bareudp.c
and drivers/net/geneve.c.

Found by Sashiko.

Fixes: 4cb47a8644 ("tunnels: PMTU discovery support for directly bridged IP packets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Link: https://patch.msgid.link/20260525203642.2389723-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2026-05-26 18:10:55 -07:00
..
Makefile vxlan: mdb: Add MDB control path support 2023-03-17 08:05:49 +00:00
vxlan_core.c vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() 2026-05-26 18:10:55 -07:00
vxlan_mdb.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vxlan_multicast.c drivers: net: drop ipv6_stub usage and use direct function calls 2026-03-29 11:21:23 -07:00
vxlan_private.h vxlan: Remove unused declarations eth_vni_hash() and fdb_head_index() 2025-11-13 17:20:54 -08:00
vxlan_vnifilter.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00