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]; }