All of lore.kernel.org
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Hulk Robot <hulkci@huawei.com>,
	Weilong Chen <chenweilong@huawei.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 09/19] rtnetlink: Fix memory(net_device) leak when ->newlink fails
Date: Thu, 30 Jul 2020 10:04:11 +0200	[thread overview]
Message-ID: <20200730074420.975889035@linuxfoundation.org> (raw)
In-Reply-To: <20200730074420.502923740@linuxfoundation.org>

From: Weilong Chen <chenweilong@huawei.com>

[ Upstream commit cebb69754f37d68e1355a5e726fdac317bcda302 ]

When vlan_newlink call register_vlan_dev fails, it might return error
with dev->reg_state = NETREG_UNREGISTERED. The rtnl_newlink should
free the memory. But currently rtnl_newlink only free the memory which
state is NETREG_UNINITIALIZED.

BUG: memory leak
unreferenced object 0xffff8881051de000 (size 4096):
  comm "syz-executor139", pid 560, jiffies 4294745346 (age 32.445s)
  hex dump (first 32 bytes):
    76 6c 61 6e 32 00 00 00 00 00 00 00 00 00 00 00  vlan2...........
    00 45 28 03 81 88 ff ff 00 00 00 00 00 00 00 00  .E(.............
  backtrace:
    [<0000000047527e31>] kmalloc_node include/linux/slab.h:578 [inline]
    [<0000000047527e31>] kvmalloc_node+0x33/0xd0 mm/util.c:574
    [<000000002b59e3bc>] kvmalloc include/linux/mm.h:753 [inline]
    [<000000002b59e3bc>] kvzalloc include/linux/mm.h:761 [inline]
    [<000000002b59e3bc>] alloc_netdev_mqs+0x83/0xd90 net/core/dev.c:9929
    [<000000006076752a>] rtnl_create_link+0x2c0/0xa20 net/core/rtnetlink.c:3067
    [<00000000572b3be5>] __rtnl_newlink+0xc9c/0x1330 net/core/rtnetlink.c:3329
    [<00000000e84ea553>] rtnl_newlink+0x66/0x90 net/core/rtnetlink.c:3397
    [<0000000052c7c0a9>] rtnetlink_rcv_msg+0x540/0x990 net/core/rtnetlink.c:5460
    [<000000004b5cb379>] netlink_rcv_skb+0x12b/0x3a0 net/netlink/af_netlink.c:2469
    [<00000000c71c20d3>] netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
    [<00000000c71c20d3>] netlink_unicast+0x4c6/0x690 net/netlink/af_netlink.c:1329
    [<00000000cca72fa9>] netlink_sendmsg+0x735/0xcc0 net/netlink/af_netlink.c:1918
    [<000000009221ebf7>] sock_sendmsg_nosec net/socket.c:652 [inline]
    [<000000009221ebf7>] sock_sendmsg+0x109/0x140 net/socket.c:672
    [<000000001c30ffe4>] ____sys_sendmsg+0x5f5/0x780 net/socket.c:2352
    [<00000000b71ca6f3>] ___sys_sendmsg+0x11d/0x1a0 net/socket.c:2406
    [<0000000007297384>] __sys_sendmsg+0xeb/0x1b0 net/socket.c:2439
    [<000000000eb29b11>] do_syscall_64+0x56/0xa0 arch/x86/entry/common.c:359
    [<000000006839b4d0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: cb626bf566eb ("net-sysfs: Fix reference count leak")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/rtnetlink.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3231,7 +3231,8 @@ replay:
 		 */
 		if (err < 0) {
 			/* If device is not registered at all, free it now */
-			if (dev->reg_state == NETREG_UNINITIALIZED)
+			if (dev->reg_state == NETREG_UNINITIALIZED ||
+			    dev->reg_state == NETREG_UNREGISTERED)
 				free_netdev(dev);
 			goto out;
 		}



  parent reply	other threads:[~2020-07-30  8:06 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  8:04 [PATCH 5.4 00/19] 5.4.55-rc1 review Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 01/19] AX.25: Fix out-of-bounds read in ax25_connect() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 02/19] AX.25: Prevent out-of-bounds read in ax25_sendmsg() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 03/19] dev: Defer free of skbs in flush_backlog Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 04/19] drivers/net/wan/x25_asy: Fix to make it work Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 05/19] ip6_gre: fix null-ptr-deref in ip6gre_init_net() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 06/19] net-sysfs: add a newline when printing tx_timeout by sysfs Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 07/19] net: udp: Fix wrong clean up for IS_UDPLITE macro Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 08/19] qrtr: orphan socket in qrtr_release() Greg Kroah-Hartman
2020-07-30  8:04 ` Greg Kroah-Hartman [this message]
2020-07-30  8:04 ` [PATCH 5.4 10/19] rxrpc: Fix sendmsg() returning EPIPE due to recvmsg() returning ENODATA Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 11/19] tcp: allow at most one TLP probe per flight Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 12/19] AX.25: Prevent integer overflows in connect and sendmsg Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 13/19] sctp: shrink stream outq only when new outcnt < old outcnt Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 14/19] sctp: shrink stream outq when fails to do addstream reconf Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 15/19] udp: Copy has_conns in reuseport_grow() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 16/19] udp: Improve load balancing for SO_REUSEPORT Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 17/19] regmap: debugfs: check count when read regmap file Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 18/19] PM: wakeup: Show statistics for deleted wakeup sources again Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 5.4 19/19] Revert "dpaa_eth: fix usage as DSA master, try 3" Greg Kroah-Hartman
2020-07-30 16:47 ` [PATCH 5.4 00/19] 5.4.55-rc1 review Guenter Roeck
2020-07-31 10:32 ` Naresh Kamboju
2020-07-31 10:32   ` Naresh Kamboju
2020-07-31 10:32   ` [LTP] " Naresh Kamboju
2020-07-31 10:32   ` Naresh Kamboju
2020-07-31 11:48   ` Arnd Bergmann
2020-07-31 11:48     ` Arnd Bergmann
2020-07-31 11:48     ` [LTP] " Arnd Bergmann
2020-07-31 11:48     ` Arnd Bergmann
2020-07-31 17:15   ` Greg Kroah-Hartman
2020-07-31 17:15     ` Greg Kroah-Hartman
2020-07-31 17:15     ` [LTP] " Greg Kroah-Hartman
2020-07-31 12:53 ` Jon Hunter

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200730074420.975889035@linuxfoundation.org \
    --to=gregkh@linuxfoundation.org \
    --cc=chenweilong@huawei.com \
    --cc=davem@davemloft.net \
    --cc=hulkci@huawei.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=stable@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.