[PATCH 4.4 034/268] mac80211_hwsim: fix possible 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: "weiyongjun (A)" <weiyongj...@huawei.com>

[ Upstream commit 0ddcff49b672239dda94d70d0fcf50317a9f4b51 ]

'hwname' is malloced in hwsim_new_radio_nl() and should be freed
before leaving from the error handling cases, otherwise it will cause
memory leak.

Fixes: ff4dd73dd2b4 ("mac80211_hwsim: check HWSIM_ATTR_RADIO_NAME length")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
Reviewed-by: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/wireless/mac80211_hwsim.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2925,8 +2925,10 @@ static int hwsim_new_radio_nl(struct sk_
        if (info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]) {
                u32 idx = nla_get_u32(info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]);
 
-               if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom))
+               if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom)) {
+                       kfree(hwname);
                        return -EINVAL;
+               }
                param.regd = hwsim_world_regdom_custom[idx];
        }