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netfilter: Fix memory leak in nf_register_net_hook

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In the rare case that when it is a attempted to use a per network device
netfilter hook and the network device does not exist the newly allocated
structure can leak.

Be a good citizen and free the newly allocated structure in the error
handling code.

Fixes: 085db2c045 ("netfilter: Per network namespace netfilter hooks.")
Reported-by: kbuild@01.org
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Eric W. Biederman 2015-07-18 10:21:14 -05:00 committed by Pablo Neira Ayuso
parent 6c7941dee9
commit e317fa505d
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/core.c
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@ -96,8 +96,10 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
new->priority = reg->priority;
nf_hook_list = find_nf_hook_list(net, reg);
if (!nf_hook_list)
if (!nf_hook_list) {
kfree(new);
return -ENOENT;
}
mutex_lock(&nf_hook_mutex);
list_for_each_entry(elem, nf_hook_list, list) {