netdev - [PATCH 1/3] tipc: fix memory leak issue

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Message-ID: <1565335017-21302-2-git-send-email-ying.xue@windriver.com>
Date:   Fri, 9 Aug 2019 15:16:55 +0800
From:   Ying Xue <ying.xue@...driver.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <jon.maloy@...csson.com>, <hdanton@...a.com>,
        <tipc-discussion@...ts.sourceforge.net>,
        <syzkaller-bugs@...glegroups.com>
Subject: [PATCH 1/3] tipc: fix memory leak issue

syzbot found the following memory leak:

[   68.602482][ T7130] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
BUG: memory leak
unreferenced object 0xffff88810df83c00 (size 512):
  comm "softirq", pid 0, jiffies 4294942354 (age 19.830s)
  hex dump (first 32 bytes):
    38 1a 0d 0f 81 88 ff ff 38 1a 0d 0f 81 88 ff ff  8.......8.......
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000009375ee42>] kmem_cache_alloc_node+0x153/0x2a0
    [<000000004c563922>] __alloc_skb+0x6e/0x210
    [<00000000ec87bfa1>] tipc_buf_acquire+0x2f/0x80
    [<00000000d151ef84>] tipc_msg_create+0x37/0xe0
    [<000000008bb437b0>] tipc_group_create_event+0xb3/0x1b0
    [<00000000947b1d0f>] tipc_group_proto_rcv+0x569/0x640
    [<00000000b75ab039>] tipc_sk_filter_rcv+0x9ac/0xf20
    [<000000000dab7a6c>] tipc_sk_rcv+0x494/0x8a0
    [<00000000023a7ddd>] tipc_node_xmit+0x196/0x1f0
    [<00000000337dd9eb>] tipc_node_distr_xmit+0x7d/0x120
    [<00000000b6375182>] tipc_group_delete+0xe6/0x130
    [<000000000361ba2b>] tipc_sk_leave+0x57/0xb0
    [<000000009df90505>] tipc_release+0x7b/0x5e0
    [<000000009f3189da>] __sock_release+0x4b/0xe0
    [<00000000d3568ee0>] sock_close+0x1b/0x30
    [<00000000266a6215>] __fput+0xed/0x300

Reported-by: syzbot+78fbe679c8ca8d264a8d@...kaller.appspotmail.com
Signed-off-by: Hillf Danton <hdanton@...a.com>
Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
 net/tipc/node.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 7ca0190..d1852fc 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -1469,10 +1469,13 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
 	spin_unlock_bh(&le->lock);
 	tipc_node_read_unlock(n);
 
-	if (unlikely(rc == -ENOBUFS))
+	if (unlikely(rc == -ENOBUFS)) {
 		tipc_node_link_down(n, bearer_id, false);
-	else
+		skb_queue_purge(list);
+		skb_queue_purge(&xmitq);
+	} else {
 		tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+	}
 
 	tipc_node_put(n);
 
-- 
2.7.4