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| author |   Cong Wang <xiyou.wangcong@gmail.com> | 2018-02-07 21:59:17 -0800 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2018-02-08 13:54:20 +0100 |
| commit | b3e456fce9f51d6276e576d00271e2813c1b8b67 (patch) | |
| tree | bf1504e9cf6429f33ab2be0381f975d5caf27c42 /net/ipv4/ip_sockglue.c | |
| parent | netfilter: x_tables: remove size check (diff) | |
| download | linux-dev-b3e456fce9f51d6276e576d00271e2813c1b8b67.tar.xz linux-dev-b3e456fce9f51d6276e576d00271e2813c1b8b67.zip | |
netfilter: ipt_CLUSTERIP: fix a race condition of proc file creation
There is a race condition between clusterip_config_entry_put()
and clusterip_config_init(), after we release the spinlock in
clusterip_config_entry_put(), a new proc file with a same IP could
be created immediately since it is already removed from the configs
list, therefore it triggers this warning:
------------[ cut here ]------------
proc_dir_entry 'ipt_CLUSTERIP/172.20.0.170' already registered
WARNING: CPU: 1 PID: 4152 at fs/proc/generic.c:330 proc_register+0x2a4/0x370 fs/proc/generic.c:329
Kernel panic - not syncing: panic_on_warn set ...
As a quick fix, just move the proc_remove() inside the spinlock.
Reported-by: <syzbot+03218bcdba6aa76441a3@syzkaller.appspotmail.com>
Fixes: 6c5d5cfbe3c5 ("netfilter: ipt_CLUSTERIP: check duplicate config when initializing")
Tested-by: Paolo Abeni <pabeni@redhat.com>
Cc: Xin Long <lucien.xin@gmail.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
0 files changed, 0 insertions, 0 deletions