==================================================================
BUG: KASAN: use-after-free in usa49_glocont_callback+0x19f/0x270 drivers/usb/serial/keyspan.c:1044
Read of size 4 at addr ffff88802623c6b0 by task kworker/0:2/1108
CPU: 0 PID: 1108 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_power_efficient gc_worker
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:1672
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:seqcount_lockdep_reader_access+0x196/0x1d0 include/linux/seqlock.h:106
Code: f9 4d 85 e4 75 16 e8 e9 98 50 f9 eb 15 e8 e2 98 50 f9 e8 2d b9 98 01 4d 85 e4 74 ea e8 d3 98 50 f9 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000495fa20 EFLAGS: 00000293
RAX: ffffffff88287bcd RBX: 0000000000000000 RCX: ffff888020e01dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000495fad0 R08: ffffffff901f115f R09: 1ffffffff203e22b
R10: dffffc0000000000 R11: fffffbfff203e22c R12: 0000000000000200
R13: ffff8880789bb380 R14: 1ffff9200092bf44 R15: dffffc0000000000
nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:338 [inline]
gc_worker+0x2e5/0x13d0 net/netfilter/nf_conntrack_core.c:1486
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
Allocated by task 1108:
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 1111:
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
The buggy address belongs to the object at ffff88802623c600
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 176 bytes inside of
192-byte region [ffff88802623c600, ffff88802623c6c0)
The buggy address belongs to the page:
page:ffffea0000988f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802623cd00 pfn:0x2623c
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea000078bf40 0000000200000002 ffff888016c41a00
raw: ffff88802623cd00 000000008010000b 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4344, ts 71451892678, free_ts 71436379817
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_pages_node include/linux/gfp.h:570 [inline]
alloc_slab_page mm/slub.c:1782 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xb6/0x4b0 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]
__kmalloc_node+0x142/0x3a0 mm/slub.c:4456
kmalloc_array_node include/linux/slab.h:700 [inline]
kcalloc_node include/linux/slab.h:705 [inline]
memcg_alloc_page_obj_cgroups+0x7d/0x120 mm/memcontrol.c:2839
memcg_slab_post_alloc_hook mm/slab.h:313 [inline]
slab_post_alloc_hook+0xba/0x380 mm/slab.h:526
slab_alloc_node mm/slub.c:3225 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238
__d_alloc+0x27/0x6d0 fs/dcache.c:1749
d_alloc+0x46/0x250 fs/dcache.c:1828
lookup_one_qstr_excl+0xc6/0x240 fs/namei.c:1567
filename_create+0x242/0x450 fs/namei.c:3887
do_symlinkat+0xbc/0x6b0 fs/namei.c:4499
__do_sys_symlinkat fs/namei.c:4526 [inline]
__se_sys_symlinkat fs/namei.c:4523 [inline]
__x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4523
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
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
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3225 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3789
alloc_inode fs/inode.c:261 [inline]
new_inode_pseudo+0x5f/0x210 fs/inode.c:1001
new_inode+0x25/0x1d0 fs/inode.c:1030
shmem_get_inode+0x304/0xa40 mm/shmem.c:2290
shmem_mknod+0x55/0x1b0 mm/shmem.c:2850
lookup_open fs/namei.c:3513 [inline]
open_last_lookups fs/namei.c:3583 [inline]
path_openat+0x120a/0x2fb0 fs/namei.c:3790
do_filp_open+0x1df/0x400 fs/namei.c:3820
do_sys_openat2+0x14b/0x500 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1282
Memory state around the buggy address:
ffff88802623c580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88802623c600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802623c680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88802623c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88802623c780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: f9 stc
1: 4d 85 e4 test %r12,%r12
4: 75 16 jne 0x1c
6: e8 e9 98 50 f9 call 0xf95098f4
b: eb 15 jmp 0x22
d: e8 e2 98 50 f9 call 0xf95098f4
12: e8 2d b9 98 01 call 0x198b944
17: 4d 85 e4 test %r12,%r12
1a: 74 ea je 0x6
1c: e8 d3 98 50 f9 call 0xf95098f4
21: fb sti
22: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp)
29: 45
* 2a: 4b c7 04 3e 00 00 00 movq $0x0,(%r14,%r15,1) <-- trapping instruction
31: 00
32: 43 c7 44 3e 08 00 00 movl $0x0,0x8(%r14,%r15,1)
39: 00 00
3b: 65 gs
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 04 25 add $0x25,%al