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| author |   Pablo Neira Ayuso <pablo@netfilter.org> | 2014-07-25 13:15:36 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-07-31 21:11:43 +0200 |
| commit | 7d5570ca8972aad58de0b4ad03a5e991c41d4ce2 (patch) | |
| tree | 011475fa651a86a0579c2b77e8714b91dbb4d213 | |
| parent | netfilter: nfnetlink_acct: avoid using NFACCT_F_OVERQUOTA with bit helper functions (diff) | |
| download | linux-dev-7d5570ca8972aad58de0b4ad03a5e991c41d4ce2.tar.xz linux-dev-7d5570ca8972aad58de0b4ad03a5e991c41d4ce2.zip | |
netfilter: nf_tables: check for unset NFTA_SET_ELEM_LIST_ELEMENTS attribute
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@netfilter.org>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index ecffb26e2f20..93692d692ebc 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; |