netfilter: ipset: fix hash:net,port,net hang with /0 subnet

stable inclusion
from stable-v5.10.163
commit ba5d2790974535401155ae89e6077b766a64f001
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7PJ9N

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ba5d2790974535401155ae89e6077b766a64f001



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[ Upstream commit a31d47be ]

The hash:net,port,net set type supports /0 subnets. However, the patch
commit 5f7b51bf titled "netfilter: ipset: Limit the maximal range
of consecutive elements to add/delete" did not take into account it and
resulted in an endless loop. The bug is actually older but the patch
5f7b51bf brings it out earlier.

Handle /0 subnets properly in hash:net,port,net set types.

Fixes: 5f7b51bf ("netfilter: ipset: Limit the maximal range of consecutive elements to add/delete")
Reported-by: Марк Коренберг <socketpair@gmail.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: zhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>