[PATCH linux-6.1.y linux-6.6.y linux-6.12.y 0/1] ndisc: backport ndisc_send_redirect() cleanup

[Li Xiasong]

Please consider backporting upstream 0784d83df3bf to 6.1.y,
6.6.y and 6.12.y. It looks like the missing prerequisite for
dbc3791e3b24 ("net: do not send ICMP/NDISC Redirects when peer
allocation fails") already queued on these trees.

dbc3791e3b24 adds "if (!peer) goto release;" inside
rcu_read_lock()/rcu_read_unlock() in ndisc_send_redirect(),
which seems to leak the read lock on the NULL-peer path on
these trees. This cleanup drops the pair (callers already hold
rcu_read_lock()), so the leak would go away.

The patch below is against 6.12.y; the identical change applies
to 6.1.y and 6.6.y.

Eric Dumazet (1):
  ndisc: ndisc_send_redirect() cleanup

 net/ipv6/ndisc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

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2.34.1