weichenchen a533b70a65 net: neighbor: fix a crash caused by mod zero ...

pneigh_enqueue() tries to obtain a random delay by mod
NEIGH_VAR(p, PROXY_DELAY). However, NEIGH_VAR(p, PROXY_DELAY)
migth be zero at that point because someone could write zero
to /proc/sys/net/ipv4/neigh/[device]/proxy_delay after the
callers check it.

This patch uses prandom_u32_max() to get a random delay instead
which avoids potential division by zero.

Signed-off-by: weichenchen <weichen.chen@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2020-12-28 14:49:48 -08:00

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bpf_sk_storage.c

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datagram.c

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datagram.h

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dev_addr_lists.c

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dev_ioctl.c

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dev.c

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devlink.c

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drop_monitor.c

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dst_cache.c

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dst.c

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failover.c

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fib_notifier.c

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fib_rules.c

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filter.c

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flow_dissector.c

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flow_offload.c

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gen_estimator.c

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gen_stats.c

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gro_cells.c

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hwbm.c

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link_watch.c

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lwt_bpf.c

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lwtunnel.c

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Makefile

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neighbour.c

net: neighbor: fix a crash caused by mod zero

2020-12-28 14:49:48 -08:00

net_namespace.c

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net-procfs.c

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net-sysfs.c

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net-sysfs.h

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net-traces.c

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netclassid_cgroup.c

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netevent.c

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netpoll.c

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netprio_cgroup.c

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page_pool.c

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pktgen.c

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ptp_classifier.c

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request_sock.c

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rtnetlink.c

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scm.c

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secure_seq.c

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skbuff.c

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skmsg.c

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sock_diag.c

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sock_map.c

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sock_reuseport.c

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sock.c

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stream.c

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sysctl_net_core.c

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timestamping.c

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tso.c

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utils.c

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xdp.c

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