[X/A/B/C][PATCH 1/1] mac80211_hwsim: fix possible memory leak in hwsim_new_radio_nl()

[Khalid Elmously]

From: "weiyongjun (A)" <weiyongjun1 at huawei.com>

CVE-2018-8087

'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 <weiyongjun1 at huawei.com>
Reviewed-by: Ben Hutchings <ben.hutchings at codethink.co.uk>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
(cherry-picked from 0ddcff49b672239dda94d70d0fcf50317a9f4b51)
Signed-off-by: Khalid Elmously <khalid.elmously at canonical.com>
---
 drivers/net/wireless/mac80211_hwsim.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 6467ffac9811..d2ab96863fce 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3142,8 +3142,10 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 	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];
 	}
 
-- 
2.17.0