@@ -5281,6 +5281,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
u8 genmask = nft_genmask_next(ctx->net);
+ u32 flags = 0, size = 0, num_exprs = 0;
struct nft_set_ext_tmpl tmpl;
struct nft_set_ext *ext, *ext2;
struct nft_set_elem elem;
@@ -5290,7 +5291,6 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
struct nft_data_desc desc;
enum nft_registers dreg;
struct nft_trans *trans;
- u32 flags = 0, size = 0;
u64 timeout;
u64 expiration;
int err, i;
@@ -5356,28 +5356,24 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
if (nla[NFTA_SET_ELEM_EXPR]) {
struct nft_expr *expr;
- if (set->num_exprs != 1)
- return -EOPNOTSUPP;
-
expr = nft_set_elem_expr_alloc(ctx, set,
nla[NFTA_SET_ELEM_EXPR]);
if (IS_ERR(expr))
return PTR_ERR(expr);
expr_array[0] = expr;
+ num_exprs = 1;
- if (set->exprs[0] && set->exprs[0]->ops != expr->ops) {
+ if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
+
} else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
struct nft_expr *expr;
struct nlattr *tmp;
int left;
- if (set->num_exprs == 0)
- return -EOPNOTSUPP;
-
i = 0;
nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
if (i == set->num_exprs) {
@@ -5394,21 +5390,25 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
goto err_set_elem_expr;
}
expr_array[i] = expr;
+ num_exprs++;
- if (expr->ops != set->exprs[i]->ops) {
+ if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
i++;
}
- if (set->num_exprs != i) {
+ if (set->num_exprs && set->num_exprs != i) {
err = -EOPNOTSUPP;
goto err_set_elem_expr;
}
+
} else if (set->num_exprs > 0) {
err = nft_set_elem_expr_clone(ctx, set, expr_array);
if (err < 0)
goto err_set_elem_expr_clone;
+
+ num_exprs = set->num_exprs;
}
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
@@ -5433,8 +5433,8 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
}
- if (set->num_exprs) {
- for (i = 0; i < set->num_exprs; i++)
+ if (num_exprs) {
+ for (i = 0; i < num_exprs; i++)
size += expr_array[i]->ops->size;
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
@@ -5522,7 +5522,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
*nft_set_ext_obj(ext) = obj;
obj->use++;
}
- for (i = 0; i < set->num_exprs; i++)
+ for (i = 0; i < num_exprs; i++)
nft_set_elem_expr_setup(ext, i, expr_array);
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
@@ -5584,7 +5584,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
err_parse_key:
nft_data_release(&elem.key.val, NFT_DATA_VALUE);
err_set_elem_expr:
- for (i = 0; i < set->num_exprs && expr_array[i]; i++)
+ for (i = 0; i < num_exprs && expr_array[i]; i++)
nft_expr_destroy(ctx, expr_array[i]);
err_set_elem_expr_clone:
return err;
This patch fixes a regression when adding an element with a stateful expression, eg. counter, but the set definition specifies no stateful expressions. Remove defensive checks otherwise this breaks backward compatibility. Fixes: 8cfd9b0f8515 ("netfilter: nftables: generalize set expressions support") Fixes: 48b0ae046ee9 ("netfilter: nftables: netlink support for several set element expressions") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- net/netfilter/nf_tables_api.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-)