==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88813483bfff by task syz.3.1419/10043
CPU: 1 UID: 0 PID: 10043 Comm: syz.3.1419 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x156/0x4c9 mm/kasan/report.c:482
kasan_report+0xdf/0x1a0 mm/kasan/report.c:595
mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
__hid_input_report.constprop.0+0x314/0x460 drivers/hid/hid-core.c:2139
hid_irq_in+0x52e/0x6b0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:mast_fill_bnode+0x78a/0x1000 lib/maple_tree.c:2844
Code: 38 4c 8d b5 58 02 00 00 4c 89 f2 48 c1 ea 03 0f b6 04 02 84 c0 74 06 0f 8e aa 05 00 00 44 0f b6 ad 58 02 00 00 e9 54 fe ff ff a1 ce 65 fa 4c 89 e7 e8 39 c7 ff ff 48 8b 54 24 08 48 b8 00 00
RSP: 0018:ffffc90001b6edb0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90001b6eff0 RCX: ffffffff874b6c78
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881103f8000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90001b6fd88
R13: ffffc90001b6f010 R14: ffffc90001b6f150 R15: ffffc90001b6f2f8
mas_push_data+0xa8b/0x19a0 lib/maple_tree.c:2962
mas_split+0x3e7/0x16b0 lib/maple_tree.c:3027
mas_commit_b_node.isra.0+0x76/0xc0 lib/maple_tree.c:3072
mas_wr_bnode+0x140/0x1d0 lib/maple_tree.c:3739
mas_wr_store_entry+0x7e3/0x2390 lib/maple_tree.c:3771
mas_store_prealloc+0x6e5/0xfb0 lib/maple_tree.c:5169
vma_iter_store_new mm/vma.h:551 [inline]
vma_complete+0x974/0xe70 mm/vma.c:351
__split_vma+0xa3d/0xdf0 mm/vma.c:564
split_vma mm/vma.c:594 [inline]
vma_modify+0x10c9/0x22c0 mm/vma.c:1672
vma_modify_flags+0x1f2/0x350 mm/vma.c:1692
mprotect_fixup+0x209/0xb40 mm/mprotect.c:756
do_mprotect_pkey+0x9e1/0xe70 mm/mprotect.c:930
__do_sys_mprotect mm/mprotect.c:951 [inline]
__se_sys_mprotect mm/mprotect.c:948 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:948
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeb163aab7
Code: 89 38 eb 84 0f 1f 80 00 00 00 00 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff e9 7a ff ff ff b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc37e142f8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007faeb00766c0 RCX: 00007faeb163aab7
RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007faeb0057000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffc37e14450
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13483b
flags: 0x200000000000000(node=0|zone=2)
raw: 0200000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 ffff8881174fc360 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), pid 2976, tgid 2976 (syz-executor), ts 868792700633, free_ts 872413136477
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0xd57/0x3b20 mm/page_alloc.c:3945
__alloc_frozen_pages_noprof+0x269/0x2230 mm/page_alloc.c:5240
alloc_pages_mpol+0xe8/0x410 mm/mempolicy.c:2486
alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2577
pagetable_alloc_noprof include/linux/mm.h:3190 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:76 [inline]
pte_alloc_one+0x1e/0x3e0 arch/x86/mm/pgtable.c:18
__pte_alloc+0x6d/0x3f0 mm/memory.c:453
copy_pte_range mm/memory.c:1237 [inline]
copy_pmd_range mm/memory.c:1392 [inline]
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0x1605/0x25e0 mm/memory.c:1535
dup_mmap+0xbb3/0x1c30 mm/mmap.c:1827
dup_mm kernel/fork.c:1529 [inline]
copy_mm kernel/fork.c:1581 [inline]
copy_process+0x718c/0x77a0 kernel/fork.c:2221
kernel_clone+0xfc/0x930 kernel/fork.c:2651
__do_sys_clone+0xd9/0x120 kernel/fork.c:2792
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 9 tgid 9 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0x7d1/0x1010 mm/page_alloc.c:2973
__pagetable_free include/linux/mm.h:3200 [inline]
pagetable_free include/linux/mm.h:3224 [inline]
pagetable_dtor_free include/linux/mm.h:3328 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x2b2/0x390 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x7c0/0x15c0 kernel/rcu/tree.c:2857
handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
Memory state around the buggy address:
ffff88813483be80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88813483bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88813483bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88813483c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88813483c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 38 4c 8d b5 cmp %cl,-0x4b(%rbp,%rcx,4)
4: 58 pop %rax
5: 02 00 add (%rax),%al
7: 00 4c 89 f2 add %cl,-0xe(%rcx,%rcx,4)
b: 48 c1 ea 03 shr $0x3,%rdx
f: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
13: 84 c0 test %al,%al
15: 74 06 je 0x1d
17: 0f 8e aa 05 00 00 jle 0x5c7
1d: 44 0f b6 ad 58 02 00 movzbl 0x258(%rbp),%r13d
24: 00
25: e9 54 fe ff ff jmp 0xfffffe7e
* 2a: e8 a1 ce 65 fa call 0xfa65ced0 <-- trapping instruction
2f: 4c 89 e7 mov %r12,%rdi
32: e8 39 c7 ff ff call 0xffffc770
37: 48 8b 54 24 08 mov 0x8(%rsp),%rdx
3c: 48 rex.W
3d: b8 .byte 0xb8