net: bridge: avoid recursive multicast port cleanup

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br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL
port groups by calling br_multicast_del_pg(). For S,G entries, that
deletion calls back into br_multicast_sg_del_exclude_ports(), so a large
number of STAR_EXCL ports consumes one kernel stack frame per port and can
hit the stack guard page.

Keep the complete port-group deletion path for cleanup, but suppress the
S,G exclude-port cleanup while that helper is already walking the same
entry. Normal deletion callers retain the existing behavior.

Fixes: 8266a0491e ("net: bridge: mcast: handle port group filter modes")
Cc: stable@vger.kernel.org
Reported-by: Vega <vega@nebusec.ai>
Assisted-by: LLM
Signed-off-by: Zixuan Chai <petalzu987@gmail.com>
Signed-off-by: Ren Wei <weir@nebusec.ai>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Zixuan Chai 2026-09-27 01:04:39 +08:00 • committed by David S. Miller

parent 6dc989ea46

commit 5158353121

1 changed files with 18 additions and 5 deletions

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net/bridge/br_multicast.c

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