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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     "weiyongjun (A)" <weiyongjun1@huawei.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 123/162] mac80211_hwsim: fix possible memory
 leak in hwsim_new_radio_nl()
Thread-Topic: [PATCH AUTOSEL for 4.4 123/162] mac80211_hwsim: fix possible
 memory leak in hwsim_new_radio_nl()
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Date:   Mon, 9 Apr 2018 00:29:20 +0000
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From: "weiyongjun (A)" <weiyongjun1@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 <weiyongjun1@huawei.com>
Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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/m=
ac80211_hwsim.c
index 8a9164da6c50..e8b770a95f7a 100644
--- 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_buff *msg, s=
truct genl_info *info)
 	if (info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]) {
 		u32 idx =3D nla_get_u32(info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]);
=20
-		if (idx >=3D ARRAY_SIZE(hwsim_world_regdom_custom))
+		if (idx >=3D ARRAY_SIZE(hwsim_world_regdom_custom)) {
+			kfree(hwname);
 			return -EINVAL;
+		}
 		param.regd =3D hwsim_world_regdom_custom[idx];
 	}
=20
--=20
2.15.1