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Message-ID: <20241108145420.2445641-1-lizhi.xu@windriver.com>
Date: Fri, 8 Nov 2024 22:54:20 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+985f827280dc3a6e7e92@...kaller.appspotmail.com>
CC: <alex.aring@...il.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <horms@...nel.org>, <kuba@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-wpan@...r.kernel.org>,
        <miquel.raynal@...tlin.com>, <netdev@...r.kernel.org>,
        <pabeni@...hat.com>, <stefan@...enfreihafen.org>,
        <syzkaller-bugs@...glegroups.com>
Subject: [PATCH] mac802154: add a check for slave data list before delete

syzkaller reported a corrupted list in ieee802154_if_remove. [1]

Remove an IEEE 802.15.4 network interface after unregister an IEEE 802.15.4
hardware device from the system.

CPU0					CPU1
====					====
genl_family_rcv_msg_doit		ieee802154_unregister_hw
ieee802154_del_iface			ieee802154_remove_interfaces
rdev_del_virtual_intf_deprecated	list_del(&sdata->list)
ieee802154_if_remove
list_del_rcu

Avoid this issue, by adding slave data state bit SDATA_STATE_LISTDONE, set
SDATA_STATE_LISTDONE when unregistering the hardware from the system, and
add state bit SDATA_STATE_LISTDONE judgment before removing the interface
to delete the list. 

[1]
kernel BUG at lib/list_debug.c:58!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 6277 Comm: syz-executor157 Not tainted 6.12.0-rc6-syzkaller-00005-g557329bcecc2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__list_del_entry_valid_or_report+0xf4/0x140 lib/list_debug.c:56
Code: e8 a1 7e 00 07 90 0f 0b 48 c7 c7 e0 37 60 8c 4c 89 fe e8 8f 7e 00 07 90 0f 0b 48 c7 c7 40 38 60 8c 4c 89 fe e8 7d 7e 00 07 90 <0f> 0b 48 c7 c7 a0 38 60 8c 4c 89 fe e8 6b 7e 00 07 90 0f 0b 48 c7
RSP: 0018:ffffc9000490f3d0 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000122 RCX: d211eee56bb28d00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff88805b278dd8 R08: ffffffff8174a12c R09: 1ffffffff2852f0d
R10: dffffc0000000000 R11: fffffbfff2852f0e R12: dffffc0000000000
R13: dffffc0000000000 R14: dead000000000100 R15: ffff88805b278cc0
FS:  0000555572f94380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056262e4a3000 CR3: 0000000078496000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del_rcu include/linux/rculist.h:157 [inline]
 ieee802154_if_remove+0x86/0x1e0 net/mac802154/iface.c:687
 rdev_del_virtual_intf_deprecated net/ieee802154/rdev-ops.h:24 [inline]
 ieee802154_del_iface+0x2c0/0x5c0 net/ieee802154/nl-phy.c:323
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2607
 ___sys_sendmsg net/socket.c:2661 [inline]
 __sys_sendmsg+0x292/0x380 net/socket.c:2690
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported-and-tested-by: syzbot+985f827280dc3a6e7e92@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=985f827280dc3a6e7e92
Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>
---
 net/mac802154/ieee802154_i.h | 1 +
 net/mac802154/iface.c        | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index 08dd521a51a5..6771c0569516 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -101,6 +101,7 @@ enum {
 
 enum ieee802154_sdata_state_bits {
 	SDATA_STATE_RUNNING,
+	SDATA_STATE_LISTDONE,
 };
 
 /* Slave interface definition.
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index c0e2da5072be..aed2fc63395d 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -683,6 +683,9 @@ void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
 {
 	ASSERT_RTNL();
 
+	if (test_bit(SDATA_STATE_LISTDONE, &sdata->state))
+		return;
+
 	mutex_lock(&sdata->local->iflist_mtx);
 	list_del_rcu(&sdata->list);
 	mutex_unlock(&sdata->local->iflist_mtx);
@@ -698,6 +701,7 @@ void ieee802154_remove_interfaces(struct ieee802154_local *local)
 	mutex_lock(&local->iflist_mtx);
 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 		list_del(&sdata->list);
+		set_bit(SDATA_STATE_LISTDONE, &sdata->state);
 
 		unregister_netdevice(sdata->dev);
 	}
-- 
2.43.0


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