From ec2c9935688fbd5eaa7c975e3e21562c3da77363 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 5 Feb 2014 15:03:35 +0000 Subject: netfilter: nf_tables: fix potential oops when dumping sets 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 Signed-off-by: Pablo Neira Ayuso diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 2a22a18..3c5a219 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -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); -- cgit v0.10.2