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SubjectRe: [PATCH] af_key: Fix memory leak in key_notify_policy.
On Fri, Jun 14, 2019 at 04:26:26PM +0800, Young Xiao wrote:
> We leak the allocated out_skb in case pfkey_xfrm_policy2msg() fails.
> Fix this by freeing it on error.
>
> Signed-off-by: Young Xiao <92siuyang@gmail.com>
> ---
> net/key/af_key.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/net/key/af_key.c b/net/key/af_key.c
> index 4af1e1d..ec414f6 100644
> --- a/net/key/af_key.c
> +++ b/net/key/af_key.c
> @@ -2443,6 +2443,7 @@ static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struc
> }
> err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
> if (err < 0)
> + kfree_skb(out_skb);
> goto out;

Did you test this?

You need to add braces, otherwise 'goto out' will happen unconditionally.

>
> out_hdr = (struct sadb_msg *) out_skb->data;
> @@ -2695,6 +2696,7 @@ static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
>
> err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
> if (err < 0)
> + kfree_skb(out_skb);
> return err;

Same here.

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