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Dave Jones reported that KASan detected out of bounds access in hash:net*
types:
[ 23.139532] ==================================================================
[ 23.146130] BUG: KASan: out of bounds access in hash_net4_add_cidr+0x1db/0x220 at addr ffff8800d4844b58
[ 23.152937] Write of size 4 by task ipset/457
[ 23.159742] =============================================================================
[ 23.166672] BUG kmalloc-512 (Not tainted): kasan: bad access detected
[ 23.173641] -----------------------------------------------------------------------------
[ 23.194668] INFO: Allocated in hash_net_create+0x16a/0x470 age=7 cpu=1 pid=456
[ 23.201836] __slab_alloc.constprop.66+0x554/0x620
[ 23.208994] __kmalloc+0x2f2/0x360
[ 23.216105] hash_net_create+0x16a/0x470
[ 23.223238] ip_set_create+0x3e6/0x740
[ 23.230343] nfnetlink_rcv_msg+0x599/0x640
[ 23.237454] netlink_rcv_skb+0x14f/0x190
[ 23.244533] nfnetlink_rcv+0x3f6/0x790
[ 23.251579] netlink_unicast+0x272/0x390
[ 23.258573] netlink_sendmsg+0x5a1/0xa50
[ 23.265485] SYSC_sendto+0x1da/0x2c0
[ 23.272364] SyS_sendto+0xe/0x10
[ 23.279168] entry_SYSCALL_64_fastpath+0x12/0x6f
The bug is fixed in the patch and the testsuite is extended in ipset
to check cidr handling more thoroughly.
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