Otherwise, the kernel oopses in nla_for_each_nested when iterating over
the unset attribute NFTA_SET_ELEM_LIST_ELEMENTS in the
nf_tables_{new,del}setelem() path.
netlink: 65524 bytes leftover after parsing attributes in process `nft'.
[...]
Oops: 0000 [#1] SMP
[...]
CPU: 2 PID: 6287 Comm: nft Not tainted 3.16.0-rc2+ #169
RIP: 0010:[<ffffffffa0526e61>] [<ffffffffa0526e61>] nf_tables_newsetelem+0x82/0xec [nf_tables]
[...]
Call Trace:
[<ffffffffa05178c4>] nfnetlink_rcv+0x2e7/0x3d7 [nfnetlink]
[<ffffffffa0517939>] ? nfnetlink_rcv+0x35c/0x3d7 [nfnetlink]
[<ffffffff8137d300>] netlink_unicast+0xf8/0x17a
[<ffffffff8137d6a5>] netlink_sendmsg+0x323/0x351
[...]
Fix this by returning -EINVAL if this attribute is not set, which
doesn't make sense at all since those commands are there to add and to
delete elements from the set.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index ecffb26..93692d6 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3073,6 +3073,9 @@ static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
struct nft_ctx ctx;
int rem, err = 0;
+ if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
+ return -EINVAL;
+
err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
if (err < 0)
return err;
@@ -3156,6 +3159,9 @@ static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
struct nft_ctx ctx;
int rem, err = 0;
+ if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
+ return -EINVAL;
+
err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
if (err < 0)
return err;
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
