mac80211_hwsim: fix possible memory leak in hwsim_new_radio_nl()

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@huawei.com>
Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry-picked from 0ddcff49b672239dda94d70d0fcf50317a9f4b51)
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Acked-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Acked-by: Andy Whitcroft <andy.whitcroft@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 731d59ee6efe411e7db9b220822ee5c916fa1970..479250bca605e9f6c7a3cd4abec07e71a74fbb65 100644 (file)
--- 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];
        }