From: Pablo Neira Ayuso pablo@netfilter.org
stable inclusion from stable-v4.19.313 commit 97f097a8091261ffa07c8889550c4026e59b6c14 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L5P0 CVE: CVE-2024-27020
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[ Upstream commit 9cff126f73a7025bcb0883189b2bed90010a57d4 ]
In case that there are two types, prefer the family specify extension.
Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Stable-dep-of: f969eb84ce48 ("netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()") Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com --- net/netfilter/nf_tables_api.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index f70fedb98695..6e4bbdea804c 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2034,14 +2034,17 @@ EXPORT_SYMBOL_GPL(nft_unregister_expr); static const struct nft_expr_type *__nft_expr_type_get(u8 family, struct nlattr *nla) { - const struct nft_expr_type *type; + const struct nft_expr_type *type, *candidate = NULL;
list_for_each_entry(type, &nf_tables_expressions, list) { - if (!nla_strcmp(nla, type->name) && - (!type->family || type->family == family)) - return type; + if (!nla_strcmp(nla, type->name)) { + if (!type->family && !candidate) + candidate = type; + else if (type->family == family) + candidate = type; + } } - return NULL; + return candidate; }
static const struct nft_expr_type *nft_expr_type_get(struct net *net,