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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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697cd36cda
When a bridge port is being deleted, do not dereference it later in
br_vlan_port_event() as it can result in a use-after-free [1] if the RCU
callback was executed before invoking the function.
[1]
[ 129.638551] ==================================================================
[ 129.646904] BUG: KASAN: use-after-free in br_vlan_port_event+0x53c/0x5fd
[ 129.654406] Read of size 8 at addr ffff8881e4aa1ae8 by task ip/483
[ 129.663008] CPU: 0 PID: 483 Comm: ip Not tainted 5.1.0-rc5-custom-02265-ga946bd73daac #1383
[ 129.672359] Hardware name: Mellanox Technologies Ltd. MSN2100-CB2FO/SA001017, BIOS 5.6.5 06/07/2016
[ 129.682484] Call Trace:
[ 129.685242] dump_stack+0xa9/0x10e
[ 129.689068] print_address_description.cold.2+0x9/0x25e
[ 129.694930] kasan_report.cold.3+0x78/0x9d
[ 129.704420] br_vlan_port_event+0x53c/0x5fd
[ 129.728300] br_device_event+0x2c7/0x7a0
[ 129.741505] notifier_call_chain+0xb5/0x1c0
[ 129.746202] rollback_registered_many+0x895/0xe90
[ 129.793119] unregister_netdevice_many+0x48/0x210
[ 129.803384] rtnl_delete_link+0xe1/0x140
[ 129.815906] rtnl_dellink+0x2a3/0x820
[ 129.844166] rtnetlink_rcv_msg+0x397/0x910
[ 129.868517] netlink_rcv_skb+0x137/0x3a0
[ 129.882013] netlink_unicast+0x49b/0x660
[ 129.900019] netlink_sendmsg+0x755/0xc90
[ 129.915758] ___sys_sendmsg+0x761/0x8e0
[ 129.966315] __sys_sendmsg+0xf0/0x1c0
[ 129.988918] do_syscall_64+0xa4/0x470
[ 129.993032] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 129.998696] RIP: 0033:0x7ff578104b58
...
[ 130.073811] Allocated by task 479:
[ 130.077633] __kasan_kmalloc.constprop.5+0xc1/0xd0
[ 130.083008] kmem_cache_alloc_trace+0x152/0x320
[ 130.088090] br_add_if+0x39c/0x1580
[ 130.092005] do_set_master+0x1aa/0x210
[ 130.096211] do_setlink+0x985/0x3100
[ 130.100224] __rtnl_newlink+0xc52/0x1380
[ 130.104625] rtnl_newlink+0x6b/0xa0
[ 130.108541] rtnetlink_rcv_msg+0x397/0x910
[ 130.113136] netlink_rcv_skb+0x137/0x3a0
[ 130.117538] netlink_unicast+0x49b/0x660
[ 130.121939] netlink_sendmsg+0x755/0xc90
[ 130.126340] ___sys_sendmsg+0x761/0x8e0
[ 130.130645] __sys_sendmsg+0xf0/0x1c0
[ 130.134753] do_syscall_64+0xa4/0x470
[ 130.138864] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 130.146195] Freed by task 0:
[ 130.149421] __kasan_slab_free+0x125/0x170
[ 130.154016] kfree+0xf3/0x310
[ 130.157349] kobject_put+0x1a8/0x4c0
[ 130.161363] rcu_core+0x859/0x19b0
[ 130.165175] __do_softirq+0x250/0xa26
[ 130.170956] The buggy address belongs to the object at ffff8881e4aa1ae8
which belongs to the cache kmalloc-1k of size 1024
[ 130.184972] The buggy address is located 0 bytes inside of
1024-byte region [ffff8881e4aa1ae8, ffff8881e4aa1ee8)
Fixes:
|
||
|---|---|---|
| .. | ||
| 6lowpan | ||
| 9p | ||
| 802 | ||
| 8021q | ||
| appletalk | ||
| atm | ||
| ax25 | ||
| batman-adv | ||
| bluetooth | ||
| bpf | ||
| bpfilter | ||
| bridge | ||
| caif | ||
| can | ||
| ceph | ||
| core | ||
| dcb | ||
| dccp | ||
| decnet | ||
| dns_resolver | ||
| dsa | ||
| ethernet | ||
| hsr | ||
| ieee802154 | ||
| ife | ||
| ipv4 | ||
| ipv6 | ||
| iucv | ||
| kcm | ||
| key | ||
| l2tp | ||
| l3mdev | ||
| lapb | ||
| llc | ||
| mac80211 | ||
| mac802154 | ||
| mpls | ||
| ncsi | ||
| netfilter | ||
| netlabel | ||
| netlink | ||
| netrom | ||
| nfc | ||
| nsh | ||
| openvswitch | ||
| packet | ||
| phonet | ||
| psample | ||
| qrtr | ||
| rds | ||
| rfkill | ||
| rose | ||
| rxrpc | ||
| sched | ||
| sctp | ||
| smc | ||
| strparser | ||
| sunrpc | ||
| switchdev | ||
| tipc | ||
| tls | ||
| unix | ||
| vmw_vsock | ||
| wimax | ||
| wireless | ||
| x25 | ||
| xdp | ||
| xfrm | ||
| compat.c | ||
| Kconfig | ||
| Makefile | ||
| socket.c | ||
| sysctl_net.c | ||