arp: Validate netmask earlier for SIOCDARP and SIOCSARP in arp_ioctl().

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When ioctl(SIOCDARP/SIOCSARP) is issued with ATF_PUBL, r.arp_netmask
must be 0.0.0.0 or 255.255.255.255.

Currently, the netmask is validated in arp_req_delete_public() or
arp_req_set_public() under rtnl_lock().

We have ATF_NETMASK test in arp_ioctl() before holding rtnl_lock(),
so let's move the netmask validation there.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240430015813.71143-3-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Kuniyuki Iwashima 2024-04-29 18:58:08 -07:00 • committed by Jakub Kicinski

parent 42033d0cfc

commit 0592367424

1 changed files with 15 additions and 12 deletions

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27

net/ipv4/arp.c

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