If no NLM_F_EXCL is set and the element already exists in the set, make
sure that both elements have the same extensions.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 434c739dfeca..11a96e8dd3cd 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3749,6 +3749,11 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
err = set->ops->insert(ctx->net, set, &elem, &ext2);
if (err) {
if (err == -EEXIST) {
+ if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
+ nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
+ nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
+ nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
+ return -EBUSY;
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
memcmp(nft_set_ext_data(ext),
--
2.1.4
--
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