linux-kernel - [PATCH AUTOSEL for 4.9 235/293] mac80211_hwsim: fix possible memory leak in hwsim_new_radio

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Message-ID: <20180409002239.163177-235-alexander.levin@microsoft.com>
Date:   Mon, 9 Apr 2018 00:25:56 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "weiyongjun (A)" <weiyongjun1@...wei.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 235/293] mac80211_hwsim: fix possible memory
 leak in hwsim_new_radio_nl()

From: "weiyongjun (A)" <weiyongjun1@...wei.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@...wei.com>
Reviewed-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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 4182c3775a72..eb6a145d2ed6 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3084,8 +3084,10 @@ 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