Re: [PATCH net 1/1] batman-adv: hold claim backbone gateways by reference

On Monday, 6 April 2026 15:17:28 CEST Ao Zhou wrote:
> From: Haoze Xie <[email protected]>
> 
> batadv_bla_add_claim() can replace claim->backbone_gw and drop the old
> gateway's last reference while readers still follow the pointer.
> 
> The netlink claim dump path dereferences claim->backbone_gw->orig and
> takes claim->backbone_gw->crc_lock without pinning the underlying
> backbone gateway. batadv_bla_check_claim() still has the same naked
> pointer access pattern.
> 
> Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate
> on a stable gateway reference until the read-side work is complete.
> This keeps the dump and claim-check paths aligned with the lifetime
> rules introduced for the other BLA claim readers.
> 
> Fixes: 23721387c409 ("batman-adv: add basic bridge loop avoidance code")
> Fixes: 04f3f5bf1883 ("batman-adv: add B.A.T.M.A.N. Dump BLA claims via netlink")
> Reported-by: Yifan Wu <[email protected]>
> Reported-by: Juefei Pu <[email protected]>
> Co-developed-by: Yuan Tan <[email protected]>
> Signed-off-by: Yuan Tan <[email protected]>
> Suggested-by: Xin Liu <[email protected]>
> Signed-off-by: Haoze Xie <[email protected]>
> Signed-off-by: Ao Zhou <[email protected]>
> ---
>  net/batman-adv/bridge_loop_avoidance.c | 27 +++++++++++++++++---------
>  1 file changed, 18 insertions(+), 9 deletions(-)

Applied, thanks!

[1/1] batman-adv: hold claim backbone gateways by reference
      https://git.open-mesh.org/linux-merge.git/commit/?h=batadv/net&id=82d8701b2c930d0e96b0dbc9115a218d791cb0d2

Best regards,
---
Sven

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