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netfilter: nf_tables: stricter validation of element data

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Make sure element data type and length do not mismatch the one specified
by the set declaration.

Fixes: 7d7402642e ("netfilter: nf_tables: variable sized set element keys / data")
Reported-by: Hugues ANGUELKOV <hanguelkov@randorisec.fr>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-07-02 04:16:30 +02:00
parent f8ebb3ac88
commit 7e6bc1f6ca
1 changed files with 8 additions and 1 deletions
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9
net/netfilter/nf_tables_api.c
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@ -5213,13 +5213,20 @@ static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
struct nft_data *data,
struct nlattr *attr)
{
u32 dtype;
int err;
err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
if (err < 0)
return err;
if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
if (set->dtype == NFT_DATA_VERDICT)
dtype = NFT_DATA_VERDICT;
else
dtype = NFT_DATA_VALUE;
if (dtype != desc->type ||
set->dlen != desc->len) {
nft_data_release(data, desc->type);
return -EINVAL;
}