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netfilter: nf_tables: validate NFT_DATA_VALUE after nft_data_init()

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Userspace might bogusly sent NFT_DATA_VERDICT in several netlink
attributes that assume NFT_DATA_VALUE. Moreover, make sure that error
path invokes nft_data_release() to decrement the reference count on the
chain object.

Fixes: 96518518cc ("netfilter: add nftables")
Fixes: 0f3cd9b369 ("netfilter: nf_tables: add range expression")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-12-06 22:09:14 +01:00
parent bffc124b6f
commit 0d2c96af79
4 changed files with 21 additions and 3 deletions
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4
net/netfilter/nf_tables_api.c
View File

@ -4519,8 +4519,10 @@ static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
return err;
err = -EINVAL;
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
nft_data_release(&elem.key.val, desc.type);
return err;
}
priv = set->ops->get(ctx->net, set, &elem, flags);
if (IS_ERR(priv))

4
net/netfilter/nft_bitwise.c
View File

@ -80,7 +80,7 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
tb[NFTA_BITWISE_MASK]);
if (err < 0)
return err;
if (d1.len != priv->len) {
if (d1.type != NFT_DATA_VALUE || d1.len != priv->len) {
err = -EINVAL;
goto err1;
}
@ -89,7 +89,7 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
tb[NFTA_BITWISE_XOR]);
if (err < 0)
goto err1;
if (d2.len != priv->len) {
if (d2.type != NFT_DATA_VALUE || d2.len != priv->len) {
err = -EINVAL;
goto err2;
}

6
net/netfilter/nft_cmp.c
View File

@ -81,6 +81,12 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
if (err < 0)
return err;
if (desc.type != NFT_DATA_VALUE) {
err = -EINVAL;
nft_data_release(&priv->data, desc.type);
return err;
}
priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
err = nft_validate_register_load(priv->sreg, desc.len);
if (err < 0)

10
net/netfilter/nft_range.c
View File

@ -66,11 +66,21 @@ static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr
if (err < 0)
return err;
if (desc_from.type != NFT_DATA_VALUE) {
err = -EINVAL;
goto err1;
}
err = nft_data_init(NULL, &priv->data_to, sizeof(priv->data_to),
&desc_to, tb[NFTA_RANGE_TO_DATA]);
if (err < 0)
goto err1;
if (desc_to.type != NFT_DATA_VALUE) {
err = -EINVAL;
goto err2;
}
if (desc_from.len != desc_to.len) {
err = -EINVAL;
goto err2;