==================================================================
BUG: KASAN: null-ptr-deref in mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:818
Write of size 63 at addr 0000000000000000 by task syz.3.3424/19247
CPU: 1 UID: 0 PID: 19247 Comm: syz.3.3424 Not tainted 6.15.0-rc4-syzkaller-00104-g588d032e9e56 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
kasan_report+0xe0/0x110 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
__asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106
mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:818
__hid_input_report.constprop.0+0x311/0x450 drivers/hid/hid-core.c:2117
hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1734
dummy_timer+0x180e/0x3a20 drivers/usb/gadget/udc/dummy_hcd.c:1994
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
handle_softirqs+0x205/0x8d0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:stack_trace_consume_entry+0x7e/0x170 kernel/stacktrace.c:89
Code: 0f 8e ad 00 00 00 31 c0 3b 6b 08 0f 83 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 0c 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 98 00 00 00 8b
RSP: 0018:ffffc900028e79f8 EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: ffffc900028e7ad8 RCX: ffffc900028e7ab0
RDX: 0000000000000000 RSI: ffffffff81685cbe RDI: ffffc900028e7ae4
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000032c0 R12: ffffffff81685930
R13: ffffc900028e7ad8 R14: 0000000000000000 R15: ffff888117b157c0
arch_stack_walk+0x85/0x100 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x37/0x50 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x286/0x470 mm/slub.c:4855
raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1153 [inline]
raw_ioctl+0xab6/0x2c30 drivers/usb/gadget/legacy/raw_gadget.c:1324
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7876be56b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fd785d25f70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000001a RCX: 00007fd7876be56b
RDX: 00007fd785d25ff0 RSI: 0000000040085507 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fd787a10320 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000200000000a40
R13: 0000000000000000 R14: 00007fd7878e5fa0 R15: 00007ffdc276ac28
==================================================================
----------------
Code disassembly (best guess):
0: 0f 8e ad 00 00 00 jle 0xb3
6: 31 c0 xor %eax,%eax
8: 3b 6b 08 cmp 0x8(%rbx),%ebp
b: 0f 83 81 00 00 00 jae 0x92
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 48 8d 7b 0c lea 0xc(%rbx),%rdi
1f: 48 89 fa mov %rdi,%rdx
22: 48 c1 ea 03 shr $0x3,%rdx
26: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
* 2a: 48 89 f8 mov %rdi,%rax <-- trapping instruction
2d: 83 e0 07 and $0x7,%eax
30: 83 c0 03 add $0x3,%eax
33: 38 d0 cmp %dl,%al
35: 7c 08 jl 0x3f
37: 84 d2 test %dl,%dl
39: 0f 85 98 00 00 00 jne 0xd7
3f: 8b .byte 0x8b