netfilter: ipset: Fix forceadd evaluation path
authorJozsef Kadlecsik <kadlec@netfilter.org>
Sat, 22 Feb 2020 11:01:43 +0000 (12:01 +0100)
committerJozsef Kadlecsik <kadlec@netfilter.org>
Sat, 22 Feb 2020 11:13:45 +0000 (12:13 +0100)
commit8af1c6fbd9239877998c7f5a591cb2c88d41fb66
tree3dd963d34f4d280fe5c878f0a96be6ab7a4d3f72
parentf66ee0410b1c3481ee75e5db9b34547b4d582465
netfilter: ipset: Fix forceadd evaluation path

When the forceadd option is enabled, the hash:* types should find and replace
the first entry in the bucket with the new one if there are no reuseable
(deleted or timed out) entries. However, the position index was just not set
to zero and remained the invalid -1 if there were no reuseable entries.

Reported-by: syzbot+6a86565c74ebe30aea18@syzkaller.appspotmail.com
Fixes: 23c42a403a9c ("netfilter: ipset: Introduction of new commands and protocol version 7")
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
net/netfilter/ipset/ip_set_hash_gen.h