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Message-ID: <67a96c79.050a0220.110943.0025.GAE@google.com> Date: Sun, 09 Feb 2025 19:03:21 -0800 From: syzbot <syzbot+52c1a7d3e5b361ccd346@...kaller.appspotmail.com> To: bentiss@...nel.org, jikos@...nel.org, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [input?] [usb?] KASAN: slab-out-of-bounds Read in mcp2221_raw_event syzbot has found a reproducer for the following issue on: HEAD commit: 9682c35ff6ec usb: typec: thunderbolt: Remove IS_ERR check .. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=10b0c2a4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed7570f7f6046a71 dashboard link: https://syzkaller.appspot.com/bug?extid=52c1a7d3e5b361ccd346 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c93b18580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124a6bdf980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3c194e311f90/disk-9682c35f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/daad45c8e7c8/vmlinux-9682c35f.xz kernel image: https://storage.googleapis.com/syzbot-assets/8a4e74467d7e/bzImage-9682c35f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+52c1a7d3e5b361ccd346@...kaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:818 Write of size 141 at addr 0000000000000000 by task swapper/1/0 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.14.0-rc1-syzkaller-g9682c35ff6ec #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 kasan_report+0xd9/0x110 mm/kasan/report.c:602 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+0x312/0x440 drivers/hid/hid-core.c:2113 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:285 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1738 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1802 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1819 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 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 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 78 dd ec 78 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 48 9d 39 00 fb f4 <fa> c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000014fd58 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8716c579 RDX: 0000000000000001 RSI: ffff888106a98800 RDI: ffff888106a98864 RBP: ffff888106a98864 R08: 0000000000000001 R09: ffffed103eb26f35 R10: ffff8881f59379ab R11: 0000000000000000 R12: ffff8881013d8000 R13: ffffffff8934ea40 R14: 0000000000000001 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699 cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x310/0x3f0 kernel/sched/idle.c:325 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423 start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:315 common_startup_64+0x12c/0x138 </TASK> ================================================================== ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 65 48 8b 05 78 dd ec mov %gs:0x78ecdd78(%rip),%rax # 0x78ecdd90 17: 78 18: 48 8b 00 mov (%rax),%rax 1b: a8 08 test $0x8,%al 1d: 75 0c jne 0x2b 1f: 66 90 xchg %ax,%ax 21: 0f 00 2d 48 9d 39 00 verw 0x399d48(%rip) # 0x399d70 28: fb sti 29: f4 hlt * 2a: fa cli <-- trapping instruction 2b: c3 ret 2c: cc int3 2d: cc int3 2e: cc int3 2f: cc int3 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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