[PATCH AUTOSEL for 4.15 059/189] mac80211_hwsim: fix possible memory leak in hwsim_new_radio_nl()

[Sasha Levin]

From: "weiyongjun (A)" <weiyongjun1@xxxxxxxxxx>

[ 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 <weiyongjun1@xxxxxxxxxx>
Reviewed-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 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 731d59ee6efe..479250bca605 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3155,8 +3155,10 @@ 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];
 	}
 
-- 
2.15.1