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netfilter: nfnetlink_queue: fix secctx memory leak

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We must call security_release_secctx to free the memory returned by
security_secid_to_secctx, otherwise memory may be leaked forever.

Fixes: ef493bd930 ("netfilter: nfnetlink_queue: add security context information")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2017-03-28 22:59:25 +08:00 committed by Pablo Neira Ayuso
parent 75c689dca9
commit 77c1c03c5b
1 changed files with 7 additions and 2 deletions
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9
net/netfilter/nfnetlink_queue.c
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@ -443,7 +443,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb) {
skb_tx_error(entskb);
return NULL;
goto nlmsg_failure;
}
nlh = nlmsg_put(skb, 0, 0,
@ -452,7 +452,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
if (!nlh) {
skb_tx_error(entskb);
kfree_skb(skb);
return NULL;
goto nlmsg_failure;
}
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = entry->state.pf;
@ -598,12 +598,17 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
nlh->nlmsg_len = skb->len;
if (seclen)
security_release_secctx(secdata, seclen);
return skb;
nla_put_failure:
skb_tx_error(entskb);
kfree_skb(skb);
net_err_ratelimited("nf_queue: error creating packet message\n");
nlmsg_failure:
if (seclen)
security_release_secctx(secdata, seclen);
return NULL;
}