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Yang Yingliang 42ca63f980 net/802/garp: fix memleak in garp_request_join() 
I got kmemleak report when doing fuzz test:

BUG: memory leak
unreferenced object 0xffff88810c909b80 (size 64):
  comm "syz", pid 957, jiffies 4295220394 (age 399.090s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 08 00 00 00 01 02 00 04  ................
  backtrace:
    [<00000000ca1f2e2e>] garp_request_join+0x285/0x3d0
    [<00000000bf153351>] vlan_gvrp_request_join+0x15b/0x190
    [<0000000024005e72>] vlan_dev_open+0x706/0x980
    [<00000000dc20c4d4>] __dev_open+0x2bb/0x460
    [<0000000066573004>] __dev_change_flags+0x501/0x650
    [<0000000035b42f83>] rtnl_configure_link+0xee/0x280
    [<00000000a5e69de0>] __rtnl_newlink+0xed5/0x1550
    [<00000000a5258f4a>] rtnl_newlink+0x66/0x90
    [<00000000506568ee>] rtnetlink_rcv_msg+0x439/0xbd0
    [<00000000b7eaeae1>] netlink_rcv_skb+0x14d/0x420
    [<00000000c373ce66>] netlink_unicast+0x550/0x750
    [<00000000ec74ce74>] netlink_sendmsg+0x88b/0xda0
    [<00000000381ff246>] sock_sendmsg+0xc9/0x120
    [<000000008f6a2db3>] ____sys_sendmsg+0x6e8/0x820
    [<000000008d9c1735>] ___sys_sendmsg+0x145/0x1c0
    [<00000000aa39dd8b>] __sys_sendmsg+0xfe/0x1d0

Calling garp_request_leave() after garp_request_join(), the attr->state
is set to GARP_APPLICANT_VO, garp_attr_destroy() won't be called in last
transmit event in garp_uninit_applicant(), the attr of applicant will be
leaked. To fix this leak, iterate and free each attr of applicant before
rerturning from garp_uninit_applicant().

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2021-07-01 11:21:57 -07:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
fddi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
garp.c net/802/garp: fix memleak in garp_request_join() 2021-07-01 11:21:57 -07:00
hippi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mrp.c net/802/mrp: fix memleak in mrp_request_join() 2021-07-01 11:14:35 -07:00
p8022.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
p8023.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
psnap.c net: 802: psnap.c: Use built-in RCU list checking 2020-02-24 13:02:53 -08:00
stp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00