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netfilter: nf_tables: Fix a use after free in nft_immediate_destroy()

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The nf_tables_rule_release() function frees "rule" so we have to use
the _safe() version of list_for_each_entry().

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Dan Carpenter 2020-07-14 13:56:22 +03:00 committed by Pablo Neira Ayuso
parent 4ff91fa0a3
commit 336f531ab1
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nft_immediate.c
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@ -103,9 +103,9 @@ static void nft_immediate_destroy(const struct nft_ctx *ctx,
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
const struct nft_data *data = &priv->data;
struct nft_rule *rule, *n;
struct nft_ctx chain_ctx;
struct nft_chain *chain;
struct nft_rule *rule;
if (priv->dreg != NFT_REG_VERDICT)
return;
@ -121,7 +121,7 @@ static void nft_immediate_destroy(const struct nft_ctx *ctx,
chain_ctx = *ctx;
chain_ctx.chain = chain;
list_for_each_entry(rule, &chain->rules, list)
list_for_each_entry_safe(rule, n, &chain->rules, list)
nf_tables_rule_release(&chain_ctx, rule);
nf_tables_chain_destroy(&chain_ctx);