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netfilter: nf_tables: free chain context when BINDING flag is missing 

syzbot found a memory leak in nf_tables_addchain() because the chain
object is not free'd correctly on error.

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: syzbot+c99868fde67014f7e9f5@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-08-11 19:39:09 +02:00 committed by Pablo Neira Ayuso
parent 2404b73c3f
commit 59136aa3b2
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/nf_tables_api.c
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@ -2018,8 +2018,10 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
if (nla[NFTA_CHAIN_NAME]) {
chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
} else {
if (!(flags & NFT_CHAIN_BINDING))
return -EINVAL;
if (!(flags & NFT_CHAIN_BINDING)) {
err = -EINVAL;
goto err1;
}
snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
chain->name = kstrdup(name, GFP_KERNEL);