==================================================================
BUG: KASAN: use-after-free in usa49_glocont_callback+0x19f/0x270 drivers/usb/serial/keyspan.c:1044
Read of size 4 at addr ffff888022dadeb0 by task v4l_id/5314
CPU: 0 PID: 5314 Comm: v4l_id Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
usa49_glocont_callback+0x19f/0x270 drivers/usb/serial/keyspan.c:1044
__usb_hcd_giveback_urb+0x35d/0x520 drivers/usb/core/hcd.c:1674
dummy_timer+0xa47/0x34a0 drivers/usb/gadget/udc/dummy_hcd.c:2012
call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
expire_timers kernel/time/timer.c:1699 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:1970
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x209/0x400 kernel/locking/lockdep.c:5741
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000327f5e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8d983b8562089300
RDX: 0000000000000000 RSI: ffffffff8a2b3e00 RDI: ffffffff8a7a4b40
RBP: ffffc9000327f700 R08: dffffc0000000000 R09: 1ffffffff2202a18
R10: dffffc0000000000 R11: fffffbfff2202a19 R12: 1ffff9200064fec8
R13: ffffffff8d11efa0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
lock_page_memcg+0xa5/0x440 mm/memcontrol.c:2047
page_remove_rmap+0x2a/0x10f0 mm/rmap.c:1351
zap_pte_range mm/memory.c:1384 [inline]
zap_pmd_range mm/memory.c:1505 [inline]
zap_pud_range mm/memory.c:1534 [inline]
zap_p4d_range mm/memory.c:1555 [inline]
unmap_page_range+0xee4/0x2410 mm/memory.c:1576
unmap_vmas+0x131/0x250 mm/memory.c:1653
exit_mmap+0x3b9/0x640 mm/mmap.c:3216
__mmput+0x115/0x390 kernel/fork.c:1133
exit_mm+0x632/0x7b0 kernel/exit.c:557
do_exit+0x5b8/0x2110 kernel/exit.c:877
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
__do_sys_exit_group kernel/exit.c:1015 [inline]
__se_sys_exit_group kernel/exit.c:1013 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbd09aec6c5
Code: Unable to access opcode bytes at RIP 0x7fbd09aec69b.
RSP: 002b:00007ffe7525f938 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fbd09bedfe8 RCX: 00007fbd09aec6c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe7525f8d0 R09: 0000000000000000
R10: 00007ffe7525f780 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000003 R14: 00007fbd09bec680 R15: 00007fbd09bee000
Allocated by task 4744:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
keyspan_port_probe+0xa7/0xd10 drivers/usb/serial/keyspan.c:2890
usb_serial_device_probe+0xd6/0x2d0 drivers/usb/serial/bus.c:47
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x276/0xc70 drivers/base/dd.c:595
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775
driver_probe_device+0x4f/0x420 drivers/base/dd.c:805
__device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927
bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
__device_attach+0x2a7/0x480 drivers/base/dd.c:999
bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
device_add+0xbcf/0x1050 drivers/base/core.c:3427
usb_serial_probe+0x265c/0x2c90 drivers/usb/serial/usb-serial.c:1149
usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x276/0xc70 drivers/base/dd.c:595
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775
driver_probe_device+0x4f/0x420 drivers/base/dd.c:805
__device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927
bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
__device_attach+0x2a7/0x480 drivers/base/dd.c:999
bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
device_add+0xbcf/0x1050 drivers/base/core.c:3427
usb_set_configuration+0x19d5/0x2030 drivers/usb/core/message.c:2223
usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x126/0x250 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x276/0xc70 drivers/base/dd.c:595
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775
driver_probe_device+0x4f/0x420 drivers/base/dd.c:805
__device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927
bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
__device_attach+0x2a7/0x480 drivers/base/dd.c:999
bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
device_add+0xbcf/0x1050 drivers/base/core.c:3427
usb_new_device+0x9f6/0x15d0 drivers/usb/core/hub.c:2637
hub_port_connect drivers/usb/core/hub.c:5502 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5642 [inline]
port_event drivers/usb/core/hub.c:5804 [inline]
hub_event+0x2b8d/0x5260 drivers/usb/core/hub.c:5886
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Freed by task 4741:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
usb_serial_device_remove+0x11c/0x1e0 drivers/usb/serial/bus.c:97
__device_release_driver drivers/base/dd.c:1247 [inline]
device_release_driver_internal+0x44c/0x710 drivers/base/dd.c:1282
bus_remove_device+0x2dd/0x400 drivers/base/bus.c:531
device_del+0x63f/0xa80 drivers/base/core.c:3615
usb_serial_disconnect+0x294/0x480 drivers/usb/serial/usb-serial.c:1202
usb_unbind_interface+0x203/0x870 drivers/usb/core/driver.c:458
__device_release_driver drivers/base/dd.c:1249 [inline]
device_release_driver_internal+0x487/0x710 drivers/base/dd.c:1282
bus_remove_device+0x2dd/0x400 drivers/base/bus.c:531
device_del+0x63f/0xa80 drivers/base/core.c:3615
usb_disable_device+0x3e7/0x8a0 drivers/usb/core/message.c:1472
usb_disconnect+0x33c/0x8a0 drivers/usb/core/hub.c:2292
hub_port_connect drivers/usb/core/hub.c:5346 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5642 [inline]
port_event drivers/usb/core/hub.c:5804 [inline]
hub_event+0x1d64/0x5260 drivers/usb/core/hub.c:5886
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
insert_work+0x54/0x3d0 kernel/workqueue.c:1366
__queue_work+0x90b/0xc80 kernel/workqueue.c:1532
queue_work_on+0x124/0x1f0 kernel/workqueue.c:1559
queue_work include/linux/workqueue.h:512 [inline]
call_usermodehelper_exec+0x2e3/0x520 kernel/umh.c:435
kobject_uevent_env+0x67b/0x890 lib/kobject_uevent.c:633
device_add+0xac2/0x1050 drivers/base/core.c:3393
netdev_register_kobject+0x184/0x320 net/core/net-sysfs.c:2014
register_netdevice+0x10e8/0x1720 net/core/dev.c:10424
virtnet_probe+0x15e1/0x2580 drivers/net/virtio_net.c:3370
virtio_dev_probe+0x81a/0xa40 drivers/virtio/virtio.c:273
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x276/0xc70 drivers/base/dd.c:595
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775
driver_probe_device+0x4f/0x420 drivers/base/dd.c:805
__driver_attach+0x45d/0x660 drivers/base/dd.c:1184
bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303
bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620
driver_register+0x32d/0x430 drivers/base/driver.c:240
virtio_net_driver_init+0x8e/0xd0 drivers/net/virtio_net.c:3549
do_one_initcall+0x272/0x730 init/main.c:1276
do_initcall_level+0x13d/0x1f0 init/main.c:1349
do_initcalls+0x4b/0x90 init/main.c:1365
kernel_init_freeable+0x3d5/0x560 init/main.c:1589
kernel_init+0x19/0x1b0 init/main.c:1480
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
The buggy address belongs to the object at ffff888022dade00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 176 bytes inside of
192-byte region [ffff888022dade00, ffff888022dadec0)
The buggy address belongs to the page:
page:ffffea00008b6b40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22dad
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00009d6e40 0000000800000008 ffff888017841a00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 6456634313, free_ts 6454617222
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2031
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x807/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
call_usermodehelper_setup+0x8a/0x260 kernel/umh.c:365
kobject_uevent_env+0x658/0x890 lib/kobject_uevent.c:629
driver_register+0x3e2/0x430 drivers/base/driver.c:248
phy_driver_register+0x174/0x270 drivers/net/phy/phy_device.c:3182
phy_drivers_register+0x3b/0xc0 drivers/net/phy/phy_device.c:3202
do_one_initcall+0x272/0x730 init/main.c:1276
do_initcall_level+0x13d/0x1f0 init/main.c:1349
do_initcalls+0x4b/0x90 init/main.c:1365
kernel_init_freeable+0x3d5/0x560 init/main.c:1589
kernel_init+0x19/0x1b0 init/main.c:1480
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
__vunmap+0x8e0/0xa80 mm/vmalloc.c:2628
free_work+0x56/0x80 mm/vmalloc.c:95
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Memory state around the buggy address:
ffff888022dadd80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888022dade00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888022dade80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888022dadf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888022dadf80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: f7 84 24 80 00 00 00 testl $0x200,0x80(%rsp)
7: 00 02 00 00
b: 43 c6 44 3c 04 f8 movb $0xf8,0x4(%r12,%r15,1)
11: 0f 85 f0 00 00 00 jne 0x107
17: 41 f7 c6 00 02 00 00 test $0x200,%r14d
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 60 0e 36 movq $0x45e0360e,0x60(%rsp)
28: e0 45
* 2a: 4b c7 04 3c 00 00 00 movq $0x0,(%r12,%r15,1) <-- trapping instruction
31: 00
32: 43 c7 44 3c 08 00 00 movl $0x0,0x8(%r12,%r15,1)
39: 00 00
3b: 65 gs
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 04 25 add $0x25,%al