diff options
| author | Vishwanath Pai <vpai@akamai.com> | 2017-02-16 20:55:45 +0100 |
|---|---|---|
| committer | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2017-02-16 20:55:45 +0100 |
| commit | 4d0d11e63493ddc126324e59f2840105dbeba725 (patch) | |
| tree | 10b65d06001f332722b90e7544d2e84e23611d91 | |
| parent | 414d819ebee11b52374f566434220887eb8246b7 (diff) | |
netfilter: ipset: Null pointer exception in ipset list:set
If we use before/after to add an element to an empty list it will cause
a kernel panic.
$> cat crash.restore
create a hash:ip
create b hash:ip
create test list:set timeout 5 size 4
add test b before a
$> ipset -R < crash.restore
Executing the above will crash the kernel.
Signed-off-by: Vishwanath Pai <vpai@akamai.com>
Reviewed-by: Josh Hunt <johunt@akamai.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
| -rw-r--r-- | kernel/net/netfilter/ipset/ip_set_list_set.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_list_set.c b/kernel/net/netfilter/ipset/ip_set_list_set.c index 51077c5..178d4eb 100644 --- a/kernel/net/netfilter/ipset/ip_set_list_set.c +++ b/kernel/net/netfilter/ipset/ip_set_list_set.c @@ -260,11 +260,14 @@ list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext, else prev = e; } + + /* If before/after is used on an empty set */ + if ((d->before > 0 && !next) || + (d->before < 0 && !prev)) + return -IPSET_ERR_REF_EXIST; + /* Re-add already existing element */ if (n) { - if ((d->before > 0 && !next) || - (d->before < 0 && !prev)) - return -IPSET_ERR_REF_EXIST; if (!flag_exist) return -IPSET_ERR_EXIST; /* Update extensions */ |