5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
[ Upstream commit 7931d32955e09d0a11b1fe0b6aac1bfa061c005c ]
register store validation for NFT_DATA_VALUE is conditional, however,
the datatype is always either NFT_DATA_VALUE or NFT_DATA_VERDICT. This
only requires a new helper function to infer the register type from the
set datatype so this conditional check can be removed. Otherwise,
pointer to chain object can be leaked through the registers.
Fixes: 96518518cc41 ("netfilter: add nftables")
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/net/netfilter/nf_tables.h | 5 +++++
net/netfilter/nf_tables_api.c | 8 ++++----
net/netfilter/nft_lookup.c | 3 ++-
3 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index ab8d84775ca87..2b99ee1303d92 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -490,6 +490,11 @@ static inline void *nft_set_priv(const struct nft_set *set)
return (void *)set->data;
}
+static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
+{
+ return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
+}
+
static inline bool nft_set_gc_is_pending(const struct nft_set *s)
{
return refcount_read(&s->refs) != 1;
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 754278b857068..f4bbddfbbc247 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4990,8 +4990,7 @@ static int nf_tables_fill_setelem(struct sk_buff *skb,
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
- set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
- set->dlen) < 0)
+ nft_set_datatype(set), set->dlen) < 0)
goto nla_put_failure;
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
@@ -9337,6 +9336,9 @@ static int nft_validate_register_store(const struct nft_ctx *ctx,
return 0;
default:
+ if (type != NFT_DATA_VALUE)
+ return -EINVAL;
+
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
return -EINVAL;
if (len == 0)
@@ -9345,8 +9347,6 @@ static int nft_validate_register_store(const struct nft_ctx *ctx,
sizeof_field(struct nft_regs, data))
return -ERANGE;
- if (data != NULL && type != NFT_DATA_VALUE)
- return -EINVAL;
return 0;
}
}
diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c
index 8bc008ff00cb7..d2f8131edaf14 100644
--- a/net/netfilter/nft_lookup.c
+++ b/net/netfilter/nft_lookup.c
@@ -101,7 +101,8 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
return -EINVAL;
err = nft_parse_register_store(ctx, tb[NFTA_LOOKUP_DREG],
- &priv->dreg, NULL, set->dtype,
+ &priv->dreg, NULL,
+ nft_set_datatype(set),
set->dlen);
if (err < 0)
return err;
--
2.43.0
