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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:23c3:b0:42f:8afa:326f with SMTP id e9e14a558f8ab-42f8afa34damr313201125ab.19.1760532003830; Wed, 15 Oct 2025 05:40:03 -0700 (PDT) Date: Wed, 15 Oct 2025 05:40:03 -0700 In-Reply-To: <35e0f3f4-def7-4a94-a982-549b6203c6e2@suse.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ef9623.050a0220.1186a4.00e5.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: slab-out-of-bounds Read in mcp2221_raw_event ================================================================== BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1276/0x12a0 drivers/hid/hid-mcp2221.c:977 Read of size 1 at addr ffff88805c577fff by task dhcpcd-run-hook/6714 CPU: 0 UID: 0 PID: 6714 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:mt_find+0x99a/0xa20 lib/maple_tree.c:6502 Code: e9 f4 fa ff ff 31 db e9 9c fd ff ff 4c 89 ff e8 dc 51 c6 f6 e9 d4 f8 ff ff e8 a2 51 c6 f6 e9 8f f8 ff ff e8 88 ca 5d f6 31 db 81 ca 5d f6 48 85 db 0f 85 80 f9 ff ff e9 df fc ff ff e8 6e ca RSP: 0018:ffffc9000457fbc8 EFLAGS: 00000292 RAX: 0000000000000000 RBX: ffff88803166c8c0 RCX: ffffffff8b5f6970 RDX: ffff888033084900 RSI: ffffffff8b5f6e74 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffffc9000457fd08 R14: 0000000000000300 R15: 0000000000000002 find_vma+0xbf/0x140 mm/mmap.c:909 lock_mm_and_find_vma+0x62/0x6e0 mm/mmap_lock.c:431 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:__put_user_4+0xd/0x20 arch/x86/lib/putuser.S:94 Code: 66 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 RSP: 0018:ffffc9000457fef8 EFLAGS: 00050206 RAX: 0000000000001a3a RBX: 0000000000000000 RCX: 00007f8b8be0df50 RDX: dffffc0000000000 RSI: ffffffff8dadd91d RDI: ffff888033084fe0 RBP: ffffc9000457ff48 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b8fc900 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 schedule_tail+0xb0/0xe0 kernel/sched/core.c:5260 ret_from_fork+0x25/0x7d0 arch/x86/kernel/process.c:154 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6476: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_node_noprof+0x28a/0x770 mm/slub.c:5317 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:579 __alloc_skb+0x166/0x380 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_uevent_skb+0x7d/0x210 lib/kobject_uevent.c:289 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline] kobject_uevent_env+0xca4/0x1870 lib/kobject_uevent.c:608 device_del+0x623/0x9f0 drivers/base/core.c:3896 gpiochip_remove+0x5aa/0x6d0 drivers/gpio/gpiolib.c:1303 release_nodes+0x116/0x240 drivers/base/devres.c:505 devres_release_group+0x1c1/0x300 drivers/base/devres.c:692 hid_device_remove+0x107/0x260 drivers/hid/hid-core.c:2836 device_remove+0xcb/0x170 drivers/base/dd.c:569 __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1297 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579 device_del+0x396/0x9f0 drivers/base/core.c:3878 hid_remove_device drivers/hid/hid-core.c:3008 [inline] hid_destroy_device+0x19c/0x240 drivers/hid/hid-core.c:3030 usbhid_disconnect+0xa0/0xe0 drivers/hid/usbhid/hid-core.c:1462 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:571 [inline] device_remove+0x125/0x170 drivers/base/dd.c:563 __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1297 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579 device_del+0x396/0x9f0 drivers/base/core.c:3878 usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418 usb_disconnect+0x2e1/0x9c0 drivers/usb/core/hub.c:2344 hub_port_connect drivers/usb/core/hub.c:5406 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x1c81/0x4fe0 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 Freed by task 5183: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2523 [inline] slab_free mm/slub.c:6611 [inline] kmem_cache_free+0x2d4/0x6c0 mm/slub.c:6721 skb_kfree_head net/core/skbuff.c:1046 [inline] skb_kfree_head net/core/skbuff.c:1043 [inline] skb_free_head+0x1b7/0x210 net/core/skbuff.c:1060 skb_release_data+0x795/0x9e0 net/core/skbuff.c:1087 skb_release_all net/core/skbuff.c:1152 [inline] __kfree_skb net/core/skbuff.c:1166 [inline] consume_skb net/core/skbuff.c:1398 [inline] consume_skb+0xbf/0x100 net/core/skbuff.c:1392 netlink_recvmsg+0x5b9/0xa90 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x1f9/0x250 net/socket.c:1100 ____sys_recvmsg+0x218/0x6b0 net/socket.c:2850 ___sys_recvmsg+0x114/0x1a0 net/socket.c:2892 __sys_recvmsg+0x16a/0x220 net/socket.c:2925 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 The buggy address belongs to the object at ffff88805c577a80 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 703 bytes to the right of allocated 704-byte region [ffff88805c577a80, ffff88805c577d40) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c574 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888140edbb40 ffffea0001f37a00 dead000000000004 raw: 0000000000000000 0000000000130013 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888140edbb40 ffffea0001f37a00 dead000000000004 head: 0000000000000000 0000000000130013 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001715d01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6343, tgid 6343 (syz-executor), ts 113786247405, free_ts 94133356886 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_slab_page mm/slub.c:3039 [inline] allocate_slab mm/slub.c:3212 [inline] new_slab+0x24a/0x360 mm/slub.c:3266 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4636 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4755 __slab_alloc_node mm/slub.c:4831 [inline] slab_alloc_node mm/slub.c:5253 [inline] kmem_cache_alloc_node_noprof+0x43c/0x770 mm/slub.c:5317 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:579 __alloc_skb+0x166/0x380 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] mpls_netconf_notify_devconf+0x4a/0x110 net/mpls/af_mpls.c:1189 mpls_dev_sysctl_register+0x1c9/0x2a0 net/mpls/af_mpls.c:1409 mpls_add_dev net/mpls/af_mpls.c:1460 [inline] mpls_dev_notify+0x4ab/0xa20 net/mpls/af_mpls.c:1600 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] register_netdevice+0x182e/0x2270 net/core/dev.c:11332 page last free pid 6136 tgid 6136 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 discard_slab mm/slub.c:3310 [inline] __put_partials+0x130/0x170 mm/slub.c:3857 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] __do_kmalloc_node mm/slub.c:5626 [inline] __kmalloc_noprof+0x2e8/0x880 mm/slub.c:5639 kmalloc_noprof include/linux/slab.h:961 [inline] tomoyo_realpath_from_path+0xc2/0x6e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x274/0x460 security/tomoyo/file.c:822 security_inode_getattr+0x116/0x290 security/security.c:2416 vfs_getattr fs/stat.c:259 [inline] vfs_fstat+0x4b/0xe0 fs/stat.c:281 __do_sys_newfstat+0x87/0x100 fs/stat.c:555 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 Memory state around the buggy address: ffff88805c577e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805c577f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805c577f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805c578000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805c578080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: e9 f4 fa ff ff jmp 0xfffffaf9 5: 31 db xor %ebx,%ebx 7: e9 9c fd ff ff jmp 0xfffffda8 c: 4c 89 ff mov %r15,%rdi f: e8 dc 51 c6 f6 call 0xf6c651f0 14: e9 d4 f8 ff ff jmp 0xfffff8ed 19: e8 a2 51 c6 f6 call 0xf6c651c0 1e: e9 8f f8 ff ff jmp 0xfffff8b2 23: e8 88 ca 5d f6 call 0xf65dcab0 28: 31 db xor %ebx,%ebx * 2a: e8 81 ca 5d f6 call 0xf65dcab0 <-- trapping instruction 2f: 48 85 db test %rbx,%rbx 32: 0f 85 80 f9 ff ff jne 0xfffff9b8 38: e9 df fc ff ff jmp 0xfffffd1c 3d: e8 .byte 0xe8 3e: 6e outsb %ds:(%rsi),(%dx) 3f: ca .byte 0xca 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=1721d542580000 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=1004952f980000