From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25BC333342C for ; Mon, 20 Oct 2025 23:57:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761004624; cv=none; b=TdGxg9d3CCtxMwuK0VTfOBVD14MB0+VVwlF2t0E2fxZ9h9jTmVIhW+mpxoviTA2aPqW5rM3tnadNck1Yt4HiRnKaLboWEFS1Sq7oYBooQPjbfG6XNXKypX2vRyA34s+reaSPzYzuijc+AB/cx0FIe3lj1bylZs3zxDc6Q35+nec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761004624; c=relaxed/simple; bh=qrVdyS5RY9nxSijoDiptbCB64hxhYMuPXeGFboVxI44=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:2c01:b0:920:865c:a8a9 with SMTP id ca18e2360f4ac-93e7643157cmr2471776239f.14.1761004622293; Mon, 20 Oct 2025 16:57:02 -0700 (PDT) Date: Mon, 20 Oct 2025 16:57:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f6cc4e.050a0220.91a22.045a.GAE@google.com> Subject: Re: [syzbot] [input?] [usb?] KASAN: slab-out-of-bounds Read in mcp2221_raw_event (2) From: syzbot To: bentiss@kernel.org, jikos@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, oneukum@suse.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: use-after-free Read in mcp2221_raw_event ================================================================== BUG: KASAN: use-after-free in mcp2221_raw_event+0x1276/0x12a0 drivers/hid/hid-mcp2221.c:977 Read of size 1 at addr ffff8880608fffff by task kworker/0:6/6472 CPU: 0 UID: 0 PID: 6472 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 mcp2221_raw_event+0x1276/0x12a0 drivers/hid/hid-mcp2221.c:977 __hid_input_report.constprop.0+0x314/0x450 drivers/hid/hid-core.c:2139 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1809/0x3a00 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 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+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x188/0x20a0 arch/x86/kernel/unwind_orc.c:494 Code: 7f 08 84 c0 0f 85 e4 09 00 00 48 89 e9 41 0f b6 45 35 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 0f 85 6b 17 00 00 <4d> 8b 7d 48 3c 01 49 83 df 00 4d 85 ff 0f 84 31 09 00 00 49 81 ff RSP: 0018:ffffc900037f6778 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff920006fed06 RDX: dffffc0000000000 RSI: ffffffff8bf1e240 RDI: ffffffff8ddafee0 RBP: ffffc900037f6830 R08: 7f6452bb8444a4d6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc900037f6838 R13: ffffc900037f67e8 R14: ffffc900037f681d R15: ffff888079bc8000 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5627 [inline] __kmalloc_node_track_caller_noprof+0x345/0x8a0 mm/slub.c:5736 kmemdup_noprof+0x29/0x60 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:765 [inline] mcp_send_report drivers/hid/hid-mcp2221.c:156 [inline] mcp_send_data_req_status+0x56/0x170 drivers/hid/hid-mcp2221.c:182 mcp_set_i2c_speed drivers/hid/hid-mcp2221.c:241 [inline] mcp2221_probe+0x38d/0xc50 drivers/hid/hid-mcp2221.c:1315 __hid_device_probe drivers/hid/hid-core.c:2775 [inline] hid_device_probe+0x5ba/0x8d0 drivers/hid/hid-core.c:2812 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 hid_add_device+0x31b/0x5c0 drivers/hid/hid-core.c:2951 usbhid_probe+0xd38/0x13f0 drivers/hid/usbhid/hid-core.c:1435 usb_probe_interface+0x303/0xa40 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x3e0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 usb_new_device+0xd07/0x1a60 drivers/usb/core/hub.c:2694 hub_port_connect drivers/usb/core/hub.c:5566 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x2f34/0x4fe0 drivers/usb/core/hub.c:5952 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x608ff flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea00017fc008 ffffea0001823f88 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 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 6288, tgid 6288 (syz-executor), ts 112267604439, free_ts 114447335346 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507 vm_area_alloc_pages mm/vmalloc.c:3647 [inline] __vmalloc_area_node mm/vmalloc.c:3724 [inline] __vmalloc_node_range_noprof+0x6f8/0x1480 mm/vmalloc.c:3897 vmalloc_user_noprof+0x9e/0xe0 mm/vmalloc.c:4050 kcov_ioctl+0x4c/0x730 kernel/kcov.c:716 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6299 tgid 6299 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906 vfree+0x1fd/0xb50 mm/vmalloc.c:3440 kcov_put kernel/kcov.c:439 [inline] kcov_put kernel/kcov.c:435 [inline] kcov_close+0x34/0x60 kernel/kcov.c:535 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x86f/0x2bf0 kernel/exit.c:966 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 get_signal+0x2671/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7c0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880608ffe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880608fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8880608fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888060900000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888060900080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 7f 08 jg 0xa 2: 84 c0 test %al,%al 4: 0f 85 e4 09 00 00 jne 0x9ee a: 48 89 e9 mov %rbp,%rcx d: 41 0f b6 45 35 movzbl 0x35(%r13),%eax 12: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 19: fc ff df 1c: 48 c1 e9 03 shr $0x3,%rcx 20: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) 24: 0f 85 6b 17 00 00 jne 0x1795 * 2a: 4d 8b 7d 48 mov 0x48(%r13),%r15 <-- trapping instruction 2e: 3c 01 cmp $0x1,%al 30: 49 83 df 00 sbb $0x0,%r15 34: 4d 85 ff test %r15,%r15 37: 0f 84 31 09 00 00 je 0x96e 3d: 49 rex.WB 3e: 81 .byte 0x81 3f: ff .byte 0xff Tested on: commit: 3a866087 Linux 6.18-rc1 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=16300d2f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f3e7b5a3627a90dd dashboard link: https://syzkaller.appspot.com/bug?extid=1018672fe70298606e5f compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=13784d42580000