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netfilter: nf_tables: fix double-free on set expression from the error path

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After copying the expression to the set element extension, release the
expression and reset the pointer to avoid a double-free from the error
path.

Fixes: 4094445229 ("netfilter: nf_tables: add elements with stateful expressions")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-03-18 01:14:58 +01:00
parent 65038428b2
commit 772f4e82b3
1 changed files with 1 additions and 0 deletions
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1
net/netfilter/nf_tables_api.c
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@ -5133,6 +5133,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
if (expr) {
memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
kfree(expr);
expr = NULL;
}
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);