On 10.01.2019 01:43, Pablo Neira Ayuso wrote: > On Wed, Dec 26, 2018 at 12:16:25PM +0300, Kirill Tkhai wrote: >> On 26.12.2018 06:50, Kangjie Lu wrote: >>> When nla_parse fails, we should not use the results (the first >>> argument). The fix checks if it fails, and if so, returns its error code >>> upstream. >>> >>> Signed-off-by: Kangjie Lu <k...@umn.edu> >>> --- >>> net/netfilter/ipset/ip_set_core.c | 4 +++- >>> 1 file changed, 3 insertions(+), 1 deletion(-) >>> >>> diff --git a/net/netfilter/ipset/ip_set_core.c >>> b/net/netfilter/ipset/ip_set_core.c >>> index 1577f2f76060..4dc8057cff02 100644 >>> --- a/net/netfilter/ipset/ip_set_core.c >>> +++ b/net/netfilter/ipset/ip_set_core.c >>> @@ -1531,8 +1531,10 @@ call_ad(struct sock *ctnl, struct sk_buff *skb, >>> struct ip_set *set, >>> memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); >>> cmdattr = (void *)&errmsg->msg + min_len; >>> >>> - nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, >>> + ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, >>> nlh->nlmsg_len - min_len, ip_set_adt_policy, NULL); > > @Kangjie: nitpick, could you align this line below? ie. > > ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, > nlh->nlmsg_len - min_len, ip_set_adt_policy, > NULL); > >>> + if (ret) >>> + return ret; >> >> In this function above nlmsg_new() allocates skb2, but I don't see, where >> you free it here. > > netlink_unicast() is responsible for releasing this skb2.
We return earlier at "if (ret)", so netlink_unicast() is not called. >>> errline = nla_data(cda[IPSET_ATTR_LINENO]); Kirill
