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([2001:a61:1331:5701:bd02:72b8:f4d3:91c]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b5cba06a5b3sm216697466b.29.2025.10.15.05.17.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Oct 2025 05:17:48 -0700 (PDT) Content-Type: multipart/mixed; boundary="------------ZY6MLU2afbK0jXl912AgSgwf" Message-ID: <35e0f3f4-def7-4a94-a982-549b6203c6e2@suse.com> Date: Wed, 15 Oct 2025 14:17:47 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Oliver Neukum Subject: Re: [syzbot] [input?] [usb?] KASAN: slab-out-of-bounds Read in mcp2221_raw_event (2) To: syzbot , bentiss@kernel.org, jikos@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68ee6a3f.050a0220.91a22.021b.GAE@google.com> Content-Language: en-US In-Reply-To: <68ee6a3f.050a0220.91a22.021b.GAE@google.com> This is a multi-part message in MIME format. --------------ZY6MLU2afbK0jXl912AgSgwf Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit #syz test: upstream 3a8660878839 On 14.10.25 17:20, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 3a8660878839 Linux 6.18-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12a705e2580000 > 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 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=132ebb34580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140fe52f980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/e767e8931970/disk-3a866087.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4cb12bdcfcea/vmlinux-3a866087.xz > kernel image: https://storage.googleapis.com/syzbot-assets/b08acfae954d/bzImage-3a866087.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1018672fe70298606e5f@syzkaller.appspotmail.com > > ================================================================== > BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948 > Read of size 1 at addr ffff8880721cbfff by task kworker/0:7/6094 > > CPU: 0 UID: 0 PID: 6094 Comm: kworker/0:7 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+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948 > __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:kasan_check_range+0x12/0x1b0 mm/kasan/generic.c:199 > Code: 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 85 f6 0f 84 64 01 00 00 48 89 f8 41 54 <44> 0f b6 c2 48 01 f0 55 53 0f 82 d7 00 00 00 eb 0f cc cc cc 48 b8 > RSP: 0018:ffffc900037b6b60 EFLAGS: 00000202 > RAX: ffff888077da86b0 RBX: ffff888077da8668 RCX: ffffffff819803ae > RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888077da86b0 > RBP: ffff888077da86b0 R08: 0000000000000002 R09: 0000000000000000 > R10: ffff888077da866f R11: 0000000000000000 R12: ffffffff8c6df2a0 > R13: ffffffff9ae57620 R14: 0000000000000000 R15: ffff888026709978 > instrument_atomic_write include/linux/instrumented.h:82 [inline] > atomic_set include/linux/atomic/atomic-instrumented.h:67 [inline] > osq_lock_init include/linux/osq_lock.h:25 [inline] > __mutex_init+0xae/0x120 kernel/locking/mutex.c:53 > i2c_register_adapter+0x15d/0x1370 drivers/i2c/i2c-core-base.c:1544 > i2c_add_adapter drivers/i2c/i2c-core-base.c:1673 [inline] > i2c_add_adapter+0x10a/0x1b0 drivers/i2c/i2c-core-base.c:1653 > devm_i2c_add_adapter+0x1b/0x90 drivers/i2c/i2c-core-base.c:1845 > mcp2221_probe+0x5f1/0xc50 drivers/hid/hid-mcp2221.c:1289 > __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 > > > Allocated by task 5918: > 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 > kmalloc_noprof include/linux/slab.h:957 [inline] > kzalloc_noprof include/linux/slab.h:1094 [inline] > ipv6_add_addr+0x4e3/0x1fe0 net/ipv6/addrconf.c:1120 > add_addr+0xde/0x350 net/ipv6/addrconf.c:3201 > add_v4_addrs+0x642/0x980 net/ipv6/addrconf.c:3263 > addrconf_gre_config net/ipv6/addrconf.c:3545 [inline] > addrconf_init_auto_addrs+0x51a/0x810 net/ipv6/addrconf.c:3559 > addrconf_notify+0xe93/0x19e0 net/ipv6/addrconf.c:3740 > 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] > __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9676 > netif_change_flags+0x108/0x160 net/core/dev.c:9705 > do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3151 > rtnl_changelink net/core/rtnetlink.c:3769 [inline] > __rtnl_newlink net/core/rtnetlink.c:3928 [inline] > rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065 > rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954 > netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 > netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] > netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 > netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg net/socket.c:742 [inline] > __sys_sendto+0x4a3/0x520 net/socket.c:2244 > __do_sys_sendto net/socket.c:2251 [inline] > __se_sys_sendto net/socket.c:2247 [inline] > __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2247 > 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 ffff8880721cbc00 > which belongs to the cache kmalloc-cg-512 of size 512 > The buggy address is located 583 bytes to the right of > allocated 440-byte region [ffff8880721cbc00, ffff8880721cbdb8) > > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x721c8 > 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 ffff88813ff30140 ffffea0001e68c00 dead000000000002 > raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 > head: 00fff00000000040 ffff88813ff30140 ffffea0001e68c00 dead000000000002 > head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 > head: 00fff00000000002 ffffea0001c87201 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 5796, tgid 5796 (sshd-session), ts 52056965840, free_ts 15121629475 > 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] > __do_kmalloc_node mm/slub.c:5626 [inline] > __kmalloc_node_track_caller_noprof+0x4db/0x8a0 mm/slub.c:5736 > kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:601 > __alloc_skb+0x166/0x380 net/core/skbuff.c:670 > alloc_skb include/linux/skbuff.h:1383 [inline] > alloc_skb_with_frags+0xe0/0x860 net/core/skbuff.c:6671 > sock_alloc_send_pskb+0x7f9/0x980 net/core/sock.c:2965 > unix_stream_sendmsg+0x39f/0x1340 net/unix/af_unix.c:2455 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg net/socket.c:742 [inline] > sock_write_iter+0x566/0x610 net/socket.c:1195 > new_sync_write fs/read_write.c:593 [inline] > vfs_write+0x7d3/0x11d0 fs/read_write.c:686 > ksys_write+0x1f8/0x250 fs/read_write.c:738 > page last free pid 1 tgid 1 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 > __free_pages mm/page_alloc.c:5302 [inline] > free_contig_range+0x183/0x4b0 mm/page_alloc.c:7146 > destroy_args+0xb69/0x12e0 mm/debug_vm_pgtable.c:958 > debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345 > do_one_initcall+0x123/0x6e0 init/main.c:1283 > do_initcall_level init/main.c:1345 [inline] > do_initcalls init/main.c:1361 [inline] > do_basic_setup init/main.c:1380 [inline] > kernel_init_freeable+0x5c8/0x920 init/main.c:1593 > kernel_init+0x1c/0x2b0 init/main.c:1483 > ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Memory state around the buggy address: > ffff8880721cbe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880721cbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >> ffff8880721cbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff8880721cc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880721cc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ================================================================== > ---------------- > Code disassembly (best guess): > 0: 00 00 add %al,(%rax) > 2: 00 00 add %al,(%rax) > 4: 0f 1f 40 00 nopl 0x0(%rax) > 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: 90 nop > 11: 90 nop > 12: 90 nop > 13: 90 nop > 14: 90 nop > 15: 90 nop > 16: 90 nop > 17: 90 nop > 18: 0f 1f 40 d6 nopl -0x2a(%rax) > 1c: 48 85 f6 test %rsi,%rsi > 1f: 0f 84 64 01 00 00 je 0x189 > 25: 48 89 f8 mov %rdi,%rax > 28: 41 54 push %r12 > * 2a: 44 0f b6 c2 movzbl %dl,%r8d <-- trapping instruction > 2e: 48 01 f0 add %rsi,%rax > 31: 55 push %rbp > 32: 53 push %rbx > 33: 0f 82 d7 00 00 00 jb 0x110 > 39: eb 0f jmp 0x4a > 3b: cc int3 > 3c: cc int3 > 3d: cc int3 > 3e: 48 rex.W > 3f: b8 .byte 0xb8 > > > --- > 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. > --------------ZY6MLU2afbK0jXl912AgSgwf Content-Type: text/x-patch; charset=UTF-8; name="0001-hid-mcp2221-validate-message-length.patch" Content-Disposition: attachment; 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