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guodeqing authored
The sync_thread_backup only checks sk_receive_queue is empty or not,
there is a situation which cannot sync the connection entries when
sk_receive_queue is empty and sk_rmem_alloc is larger than sk_rcvbuf,
the sync packets are dropped in __udp_enqueue_schedule_skb, this is
because the packets in reader_queue is not read, so the rmem is
not reclaimed.

Here I add the check of whether the reader_queue of the udp sock is
empty or not to solve this problem.

Fixes: 2276f58a ("udp: use a separate rx queue for packet reception")
Reported-by: default avatarzhouxudong <zhouxudong8@huawei.com>
Signed-off-by: default avatarguodeqing <geffrey.guo@huawei.com>
Acked-by: default avatarJulian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
8210e344
Linux kernel
============

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