ieee802154: Don't leak memory in ieee802154_nl_fill_phy

In net/ieee802154/nl-phy.c::ieee802154_nl_fill_phy() I see two small
issues.
1) If the allocation of 'buf' fails we may just as well return -EMSGSIZE
   directly rather than jumping to 'out:' and do a pointless kfree(0).
2) We do not free 'buf' unless we jump to one of the error labels and this
   leaks memory.
This patch should address both.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>

diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index ed0eab3..02548b2 100644 (file)
--- a/net/ieee802154/nl-phy.c
+++ b/net/ieee802154/nl-phy.c
@@ -44,7 +44,7 @@ static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
        pr_debug("%s\n", __func__);
 
        if (!buf)
-               goto out;
+               return -EMSGSIZE;
 
        hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
                IEEE802154_LIST_PHY);
@@ -65,6 +65,7 @@ static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
                                pages * sizeof(uint32_t), buf);
 
        mutex_unlock(&phy->pib_lock);
+       kfree(buf);
        return genlmsg_end(msg, hdr);
 
 nla_put_failure: