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| author |   weichenchen <weichen.chen@linux.alibaba.com> | 2020-12-25 13:44:45 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-12-28 14:49:48 -0800 |
| commit | a533b70a657c03137dd49cbcfee70aac086ab2b1 (patch) | |
| tree | ec36cd2b1aaea81ad270c0bb939a083d8a47829a /net/sched/sch_choke.c | |
| parent | ipv4: Ignore ECN bits for fib lookups in fib_compute_spec_dst() (diff) | |
| download | wireguard-linux-a533b70a657c03137dd49cbcfee70aac086ab2b1.tar.xz wireguard-linux-a533b70a657c03137dd49cbcfee70aac086ab2b1.zip | |
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>
Diffstat (limited to 'net/sched/sch_choke.c')
0 files changed, 0 insertions, 0 deletions