linux-kernel - [PATCH -next] macvlan: Fix memleak in macvlan_changelink

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Date:   Thu, 18 Jun 2020 21:26:29 +0800
From:   Zheng Bin <zhengbin13@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>,
        <michael-dev@...i-braun.de>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <zhengbin13@...wei.com>, <yi.zhang@...wei.com>
Subject: [PATCH -next] macvlan: Fix memleak in macvlan_changelink_sources

macvlan_changelink_sources
  if (addr)
    ret = macvlan_hash_add_source(vlan, addr)
  nla_for_each_attr(nla, head, len, rem)
    ret = macvlan_hash_add_source(vlan, addr)
    -->If fail, need to free previous malloc memory

Fixes: 79cf79abce71 ("macvlan: add source mode")
Signed-off-by: Zheng Bin <zhengbin13@...wei.com>
---
 drivers/net/macvlan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 6a6cc9f75307..0017c5d28a27 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1379,8 +1379,10 @@ static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,

 			addr = nla_data(nla);
 			ret = macvlan_hash_add_source(vlan, addr);
-			if (ret)
+			if (ret) {
+				macvlan_flush_sources(vlan->port, vlan);
 				return ret;
+			}
 		}
 	} else {
 		return -EINVAL;
--
2.25.4