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Kyle Zeng
4032f8ed10
OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb
length in OVS_CB(skb)->cutlen. When a later userspace action segments a
GSO skb, queue_gso_packets() reuses that delta for each smaller segment.
A segment can then reach queue_userspace_packet() with cutlen greater
than skb->len, underflowing the length passed to skb_zerocopy().
Store the maximum preserved length instead and bound each consumer
against the current skb length. Use U32_MAX as the no-truncation
sentinel so the value remains valid if skb geometry changes before a
consumer handles it.
Fixes: f2a4d086ed ("openvswitch: Add packet truncation support.")
Cc: [email protected]
Assisted-by: Codex:gpt-5.5
Signed-off-by: Kyle Zeng <[email protected]>
Reviewed-by: Ilya Maximets <[email protected]>
Reviewed-by: Aaron Conole <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>