[PATCH net v2 0/2] octeon_ep, octeon_ep_vf: fix skb frags overflow in the RX path

[Maoyi Xie <maoyixie.tju@gmail.com>]

Both octeon_ep and octeon_ep_vf build an skb for a multi-buffer RX packet
by adding one fragment per buffer_size chunk of a device-reported length.
Neither bounds the count against MAX_SKB_FRAGS. A long packet yields about
18 fragments, one past the default MAX_SKB_FRAGS of 17, so
skb_add_rx_frag() writes past shinfo->frags[].

Each driver now checks the fragment count before it builds the skb and
drops a packet that would not fit.

v2:
 - move the check before (napi_)build_skb() so the driver does not build an
   skb only to free it, per Maciej Fijalkowski.
 - the frag count check uses the same u16 length the fragment loop uses.
The repeated linear/non-linear code in octeon_ep_vf that Maciej noted is a
separate cleanup, left for net-next to keep this fix minimal.

v1: https://lore.kernel.org/r/20260701112825.1653044-1-maoyixie.tju@gmail.com


Maoyi Xie (2):
  octeon_ep: fix skb frags overflow in the RX path
  octeon_ep_vf: fix skb frags overflow in the RX path

 .../net/ethernet/marvell/octeon_ep/octep_rx.c |  9 +++++++++
 .../marvell/octeon_ep_vf/octep_vf_rx.c        | 20 +++++++++++++++++++
 2 files changed, 29 insertions(+)

-- 
2.34.1