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netfilter: nf_tables: fix potential oops when dumping sets

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Commit c9c8e48597 (netfilter: nf_tables: dump sets in all existing families)
changed nft_ctx_init_from_setattr() to only look up the address family if it
is not NFPROTO_UNSPEC. However if it is NFPROTO_UNSPEC and a table attribute
is given, nftables_afinfo_lookup() will dereference the NULL afi pointer.

Fix by checking for non-NULL afi and also move a check added by that commit
to the proper position.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-02-05 15:03:35 +00:00 committed by Pablo Neira Ayuso
parent 53b70287dd
commit ec2c993568
1 changed files with 5 additions and 3 deletions
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8
net/netfilter/nf_tables_api.c
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@ -1943,6 +1943,9 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
}
if (nla[NFTA_SET_TABLE] != NULL) {
if (afi == NULL)
return -EAFNOSUPPORT;
table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@ -2428,6 +2431,8 @@ static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
struct nft_ctx ctx;
int err;
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
return -EAFNOSUPPORT;
if (nla[NFTA_SET_TABLE] == NULL)
return -EINVAL;
@ -2435,9 +2440,6 @@ static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
if (err < 0)
return err;
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
return -EAFNOSUPPORT;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
if (IS_ERR(set))
return PTR_ERR(set);