==================================================================
BUG: KASAN: use-after-free in macsec_get_iflink+0x70/0x80 drivers/net/macsec.c:3649
Read of size 4 at addr ffff88812764e0d0 by task kworker/u4:27/5358
CPU: 0 PID: 5358 Comm: kworker/u4:27 Not tainted 5.15.180-syzkaller-android13-5.15.180_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
print_address_description+0x87/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0x179/0x1c0 mm/kasan/report.c:444
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
macsec_get_iflink+0x70/0x80 drivers/net/macsec.c:3649
dev_get_iflink+0x6f/0xc0 net/core/dev.c:711
default_operstate net/core/link_watch.c:41 [inline]
rfc2863_policy+0x127/0x2b0 net/core/link_watch.c:53
linkwatch_do_dev+0x3c/0x160 net/core/link_watch.c:160
linkwatch_forget_dev+0x170/0x180 net/core/link_watch.c:238
netdev_run_todo+0x2ec/0x9f0 net/core/dev.c:10686
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
default_device_exit_batch+0x38f/0x3f0 net/core/dev.c:11683
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:599
process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
kthread+0x421/0x510 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Allocated by task 1681:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512
__kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521
kasan_kmalloc include/linux/kasan.h:227 [inline]
__kmalloc+0x13f/0x2c0 mm/slub.c:4431
__kmalloc_node include/linux/slab.h:484 [inline]
kmalloc_node include/linux/slab.h:639 [inline]
kvmalloc_node+0x1f0/0x4d0 mm/util.c:628
kvmalloc include/linux/mm.h:851 [inline]
kvzalloc include/linux/mm.h:859 [inline]
alloc_netdev_mqs+0x8c/0xc90 net/core/dev.c:10899
rtnl_create_link+0x2e1/0x9d0 net/core/rtnetlink.c:3232
veth_newlink+0x2df/0xe20 drivers/net/veth.c:1667
__rtnl_newlink net/core/rtnetlink.c:3524 [inline]
rtnl_newlink+0x14c7/0x2050 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x951/0xc40 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341
netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
__sys_sendto+0x564/0x720 net/socket.c:2063
__do_sys_sendto net/socket.c:2075 [inline]
__se_sys_sendto net/socket.c:2071 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:2071
x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 5358:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
slab_free mm/slub.c:3521 [inline]
kfree+0xcc/0x270 mm/slub.c:4583
kvfree+0x35/0x40 mm/util.c:664
netdev_freemem+0x3f/0x60 net/core/dev.c:10853
netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1903
device_release+0x95/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:713 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x178/0x260 lib/kobject.c:761
netdev_run_todo+0x869/0x9f0 net/core/dev.c:10709
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
default_device_exit_batch+0x38f/0x3f0 net/core/dev.c:11683
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:599
process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
kthread+0x421/0x510 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
The buggy address belongs to the object at ffff88812764e000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 208 bytes inside of
4096-byte region [ffff88812764e000, ffff88812764f000)
The buggy address belongs to the page:
page:ffffea00049d9200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127648
head:ffffea00049d9200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043380
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1681, ts 99047241347, free_ts 98995567126
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
__alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5781
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1932 [inline]
new_slab+0x9a/0x4e0 mm/slub.c:1995
___slab_alloc+0x39e/0x830 mm/slub.c:3028
__slab_alloc+0x4a/0x90 mm/slub.c:3115
slab_alloc_node mm/slub.c:3206 [inline]
slab_alloc mm/slub.c:3250 [inline]
__kmalloc+0x172/0x2c0 mm/slub.c:4427
__kmalloc_node include/linux/slab.h:484 [inline]
kmalloc_node include/linux/slab.h:639 [inline]
kvmalloc_node+0x1f0/0x4d0 mm/util.c:628
kvmalloc include/linux/mm.h:851 [inline]
kvzalloc include/linux/mm.h:859 [inline]
alloc_netdev_mqs+0x8c/0xc90 net/core/dev.c:10899
rtnl_create_link+0x2e1/0x9d0 net/core/rtnetlink.c:3232
__rtnl_newlink net/core/rtnetlink.c:3514 [inline]
rtnl_newlink+0x13dc/0x2050 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x951/0xc40 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1472 [inline]
free_pcp_prepare mm/page_alloc.c:1544 [inline]
free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
free_the_page mm/page_alloc.c:805 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5857
__free_slab+0xec/0x1d0 mm/slub.c:2020
free_slab mm/slub.c:2035 [inline]
discard_slab+0x29/0x40 mm/slub.c:2041
__slab_free+0x205/0x290 mm/slub.c:3426
do_slab_free mm/slub.c:3509 [inline]
___cache_free+0x109/0x120 mm/slub.c:3530
qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
slab_alloc_node mm/slub.c:3240 [inline]
slab_alloc mm/slub.c:3250 [inline]
kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
kmem_cache_zalloc include/linux/slab.h:737 [inline]
taskstats_tgid_alloc kernel/taskstats.c:561 [inline]
taskstats_exit+0x142/0xc40 kernel/taskstats.c:600
do_exit+0x63b/0x2ca0 kernel/exit.c:865
do_group_exit+0x141/0x310 kernel/exit.c:1002
Memory state around the buggy address:
ffff88812764df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812764e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88812764e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88812764e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88812764e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
tipc: Left network mode
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
device veth1_macvtap left promiscuous mode
device veth0_vlan left promiscuous mode
device veth0_vlan left promiscuous mode
device veth1_macvtap left promiscuous mode
device veth0_vlan left promiscuous mode
tipc: Disabling bearer
tipc: Left network mode
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
device veth1_macvtap left promiscuous mode