==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x106a/0x1240 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88805600bfff by task swapper/1/0
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
mcp2221_raw_event+0x106a/0x1240 drivers/hid/hid-mcp2221.c:948
__hid_input_report drivers/hid/hid-core.c:2139 [inline]
hid_input_report+0x40a/0x520 drivers/hid/hid-core.c:2166
hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661
dummy_timer+0x85f/0x44c0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5193
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 e9 27 05 00 00 4c 8b 75 d0 4c 89 e7 e8 5f cc b7 09 e8 ba bb 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 58 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90000197b58 EFLAGS: 00000282
RAX: 4732e3fa7e49b800 RBX: 0000000000000000 RCX: 4732e3fa7e49b800
RDX: 0000000000000000 RSI: ffffffff8d70d450 RDI: ffffffff8bbf0760
RBP: ffffc90000197bb0 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e
R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: ffff88801ca95ac0
R13: dffffc0000000000 R14: ffff88802730bc80 R15: ffff8880b893abd8
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x17a0/0x4cc0 kernel/sched/core.c:6929
schedule_idle+0x52/0x90 kernel/sched/core.c:7052
do_idle+0x4a7/0x510 kernel/sched/idle.c:358
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x147
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5600b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 13, tgid 13 (kworker/u8:1), ts 77311334338, free_ts 150115261782
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3055 [inline]
allocate_slab+0x96/0x350 mm/slub.c:3228
new_slab mm/slub.c:3282 [inline]
___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4770
__slab_alloc_node mm/slub.c:4846 [inline]
slab_alloc_node mm/slub.c:5268 [inline]
kmem_cache_alloc_node_noprof+0x4c5/0x710 mm/slub.c:5332
kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:579
__alloc_skb+0x142/0x2d0 net/core/skbuff.c:670
alloc_skb include/linux/skbuff.h:1383 [inline]
nlmsg_new include/net/netlink.h:1055 [inline]
inet6_rt_notify+0x170/0x470 net/ipv6/route.c:6345
fib6_add_rt2node+0x1876/0x33a0 net/ipv6/ip6_fib.c:1275
fib6_add+0x8da/0x18a0 net/ipv6/ip6_fib.c:1528
__ip6_ins_rt net/ipv6/route.c:1351 [inline]
ip6_ins_rt+0xc8/0x120 net/ipv6/route.c:1361
__ipv6_ifa_notify+0x63f/0xac0 net/ipv6/addrconf.c:6283
ipv6_ifa_notify net/ipv6/addrconf.c:6322 [inline]
addrconf_dad_completed+0x180/0xd60 net/ipv6/addrconf.c:4320
page last free pid 5836 tgid 5836 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
__slab_free+0x2e7/0x390 mm/slub.c:5962
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4970 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__kmalloc_cache_node_noprof+0x405/0x6f0 mm/slub.c:5771
kmalloc_node_noprof include/linux/slab.h:983 [inline]
__get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3182
__vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857
__vmalloc_node_noprof mm/vmalloc.c:3960 [inline]
vzalloc_noprof+0xb2/0xf0 mm/vmalloc.c:4034
alloc_counters+0xd3/0x6d0 net/ipv4/netfilter/ip_tables.c:799
compat_copy_entries_to_user+0xa4/0x520 net/ipv6/netfilter/ip6_tables.c:1570
compat_get_entries net/ipv6/netfilter/ip6_tables.c:1613 [inline]
do_ip6t_get_ctl+0xb89/0x1180 net/ipv6/netfilter/ip6_tables.c:1674
nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x1ed/0x290 net/ipv6/ipv6_sockglue.c:1473
do_sock_getsockopt+0x372/0x450 net/socket.c:2421
__sys_getsockopt+0x128/0x1d0 net/socket.c:2450
Memory state around the buggy address:
ffff88805600be80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88805600bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805600bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88805600c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88805600c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 0f 84 3c 01 00 00 je 0x142
6: 48 85 db test %rbx,%rbx
9: 0f 85 63 01 00 00 jne 0x172
f: e9 27 05 00 00 jmp 0x53b
14: 4c 8b 75 d0 mov -0x30(%rbp),%r14
18: 4c 89 e7 mov %r12,%rdi
1b: e8 5f cc b7 09 call 0x9b7cc7f
20: e8 ba bb 36 00 call 0x36bbdf
25: fb sti
26: 4c 8b 65 c0 mov -0x40(%rbp),%r12
* 2a: 49 8d bc 24 58 16 00 lea 0x1658(%r12),%rdi <-- trapping instruction
31: 00
32: 48 89 f8 mov %rdi,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
3e: 84 c0 test %al,%al