From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>,
Jozsef Kadlecsik <kadlec@netfilter.org>,
Florian Westphal <fw@strlen.de>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] netfilter: nf_tables: Fix dereference of null pointer flow
Date: Fri, 25 Jun 2021 12:59:01 +0300 [thread overview]
Message-ID: <20210625095901.GH2040@kadam> (raw)
In-Reply-To: <20210624195718.170796-1-colin.king@canonical.com>
Btw, why is there no clean up if nft_table_validate() fails?
net/netfilter/nf_tables_api.c
3432 list_add_tail_rcu(&rule->list, &old_rule->list);
3433 else
3434 list_add_rcu(&rule->list, &chain->rules);
3435 }
3436 }
3437 kvfree(expr_info);
3438 chain->use++;
3439
3440 if (flow)
3441 nft_trans_flow_rule(trans) = flow;
3442
3443 if (nft_net->validate_state == NFT_VALIDATE_DO)
3444 return nft_table_validate(net, table);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The cleanup for this would be quite involved unfortunately... Not
necessarily something to attempt without being able to test the code.
3445
3446 return 0;
3447
3448 err_destroy_flow_rule:
3449 nft_flow_rule_destroy(flow);
3450 err_release_rule:
3451 nf_tables_rule_release(&ctx, rule);
3452 err_release_expr:
3453 for (i = 0; i < n; i++) {
3454 if (expr_info[i].ops) {
3455 module_put(expr_info[i].ops->type->owner);
3456 if (expr_info[i].ops->type->release_ops)
3457 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3458 }
3459 }
3460 kvfree(expr_info);
3461
3462 return err;
3463 }
regards,
dan carpenter
next prev parent reply other threads:[~2021-06-25 9:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 19:57 [PATCH][next] netfilter: nf_tables: Fix dereference of null pointer flow Colin King
2021-06-25 9:59 ` Dan Carpenter [this message]
2021-06-25 10:20 ` Pablo Neira Ayuso
2021-06-25 10:33 ` Dan Carpenter
2021-06-25 10:06 ` AW: " Walter Harms
2021-06-25 10:21 ` Pablo Neira Ayuso
2021-07-02 0:56 ` Pablo Neira Ayuso
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