lkml.org 
[lkml]   [2019]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 4.19 203/205] netfilter: nf_tables: avoid BUG_ON usage
Date
From: Florian Westphal <fw@strlen.de>

[ Upstream commit fa5950e498e7face21a1761f327e6c1152f778c3 ]

None of these spots really needs to crash the kernel.
In one two cases we can jsut report error to userspace, in the other
cases we can just use WARN_ON (and leak memory instead).

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/netfilter/nf_tables_api.c | 9 ++++++---
net/netfilter/nft_cmp.c | 6 ++++--
net/netfilter/nft_reject.c | 6 ++++--
3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 24fddf0322790..289d079008ee8 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1031,7 +1031,8 @@ static int nf_tables_deltable(struct net *net, struct sock *nlsk,

static void nf_tables_table_destroy(struct nft_ctx *ctx)
{
- BUG_ON(ctx->table->use > 0);
+ if (WARN_ON(ctx->table->use > 0))
+ return;

rhltable_destroy(&ctx->table->chains_ht);
kfree(ctx->table->name);
@@ -1446,7 +1447,8 @@ static void nf_tables_chain_destroy(struct nft_ctx *ctx)
{
struct nft_chain *chain = ctx->chain;

- BUG_ON(chain->use > 0);
+ if (WARN_ON(chain->use > 0))
+ return;

/* no concurrent access possible anymore */
nf_tables_chain_free_chain_rules(chain);
@@ -7253,7 +7255,8 @@ int __nft_release_basechain(struct nft_ctx *ctx)
{
struct nft_rule *rule, *nr;

- BUG_ON(!nft_is_base_chain(ctx->chain));
+ if (WARN_ON(!nft_is_base_chain(ctx->chain)))
+ return 0;

nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
diff --git a/net/netfilter/nft_cmp.c b/net/netfilter/nft_cmp.c
index fa90a8402845d..79d48c1d06f4d 100644
--- a/net/netfilter/nft_cmp.c
+++ b/net/netfilter/nft_cmp.c
@@ -79,7 +79,8 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,

err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc,
tb[NFTA_CMP_DATA]);
- BUG_ON(err < 0);
+ if (err < 0)
+ return err;

priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
err = nft_validate_register_load(priv->sreg, desc.len);
@@ -129,7 +130,8 @@ static int nft_cmp_fast_init(const struct nft_ctx *ctx,

err = nft_data_init(NULL, &data, sizeof(data), &desc,
tb[NFTA_CMP_DATA]);
- BUG_ON(err < 0);
+ if (err < 0)
+ return err;

priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
err = nft_validate_register_load(priv->sreg, desc.len);
diff --git a/net/netfilter/nft_reject.c b/net/netfilter/nft_reject.c
index 29f5bd2377b0d..b48e58cceeb72 100644
--- a/net/netfilter/nft_reject.c
+++ b/net/netfilter/nft_reject.c
@@ -94,7 +94,8 @@ static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {

int nft_reject_icmp_code(u8 code)
{
- BUG_ON(code > NFT_REJECT_ICMPX_MAX);
+ if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
+ return ICMP_NET_UNREACH;

return icmp_code_v4[code];
}
@@ -111,7 +112,8 @@ static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {

int nft_reject_icmpv6_code(u8 code)
{
- BUG_ON(code > NFT_REJECT_ICMPX_MAX);
+ if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
+ return ICMPV6_NOROUTE;

return icmp_code_v6[code];
}
--
2.20.1
\
 
 \ /
  Last update: 2019-11-08 13:02    [W:0.387 / U:14.356 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site