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netfilter: nf_tables: fix possible null-pointer dereference in object update 

Not all objects have an update operation. If the object type doesn't
implement an update operation and the user tries to update it will hit
EOPNOTSUPP.

Fixes: d62d0ba97b ("netfilter: nf_tables: Introduce stateful object update operation")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Fernando Fernandez Mancera 2019-09-04 14:29:07 +02:00 committed by Pablo Neira Ayuso
parent 85936e56e9
commit aa4095a156
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_tables_api.c
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@ -5140,6 +5140,9 @@ static int nf_tables_updobj(const struct nft_ctx *ctx,
struct nft_trans *trans;
int err;
if (!obj->ops->update)
return -EOPNOTSUPP;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
sizeof(struct nft_trans_obj));
if (!trans)