[PATCH 4.4 074/105] mac80211_hwsim: Fix memory leak in hwsim_new_radio_nl()

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben.hutchi...@codethink.co.uk>


[ Upstream commit 67bd52386125ce1159c0581cbcd2740addf33cd4 ]

hwsim_new_radio_nl() now copies the name attribute in order to add a
null-terminator.  mac80211_hwsim_new_radio() (indirectly) copies it
again into the net_device structure, so the first copy is not used or
freed later.  Free the first copy before returning.

Fixes: ff4dd73dd2b4 ("mac80211_hwsim: check HWSIM_ATTR_RADIO_NAME length")
Signed-off-by: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/wireless/mac80211_hwsim.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2885,6 +2885,7 @@ static int hwsim_new_radio_nl(struct sk_
 {
        struct hwsim_new_radio_params param = { 0 };
        const char *hwname = NULL;
+       int ret;
 
        param.reg_strict = info->attrs[HWSIM_ATTR_REG_STRICT_REG];
        param.p2p_device = info->attrs[HWSIM_ATTR_SUPPORT_P2P_DEVICE];
@@ -2924,7 +2925,9 @@ static int hwsim_new_radio_nl(struct sk_
                param.regd = hwsim_world_regdom_custom[idx];
        }
 
-       return mac80211_hwsim_new_radio(info, &param);
+       ret = mac80211_hwsim_new_radio(info, &param);
+       kfree(hwname);
+       return ret;
 }
 
 static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)