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Message-ID: <87plaol6r3.wl-tiwai@suse.de> Date: Wed, 15 Oct 2025 13:54:56 +0200 From: Takashi Iwai <tiwai@...e.de> To: syzbot <syzbot+ce952c05d40571083fd6@...kaller.appspotmail.com> Cc: clemens@...isch.de, linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, perex@...ex.cz, syzkaller-bugs@...glegroups.com, tiwai@...e.com Subject: Re: [syzbot] [sound?] KASAN: slab-use-after-free Read in snd_usbmidi_error_timer (2) On Wed, 24 Sep 2025 07:35:35 +0200, syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: cec1e6e5d1ab Merge tag 'sched_ext-for-6.17-rc7-fixes' of g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=127fc142580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4d8792ecb6308d0f > dashboard link: https://syzkaller.appspot.com/bug?extid=ce952c05d40571083fd6 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/f000e10907d9/disk-cec1e6e5.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/e8da77cc2298/vmlinux-cec1e6e5.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9ad6164e7d28/bzImage-cec1e6e5.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+ce952c05d40571083fd6@...kaller.appspotmail.com > > ================================================================== > BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] > BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] > BUG: KASAN: slab-use-after-free in snd_usbmidi_error_timer+0x15d/0x660 sound/usb/midi.c:355 > Read of size 4 at addr ffff8880310f9a10 by task syz.4.2001/13191 > > CPU: 0 UID: 0 PID: 13191 Comm: syz.4.2001 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 > Call Trace: > <IRQ> > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:378 [inline] > print_report+0xca/0x240 mm/kasan/report.c:482 > kasan_report+0x118/0x150 mm/kasan/report.c:595 > check_region_inline mm/kasan/generic.c:-1 [inline] > kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 > instrument_atomic_read include/linux/instrumented.h:68 [inline] > atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] > snd_usbmidi_error_timer+0x15d/0x660 sound/usb/midi.c:355 > call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747 > expire_timers kernel/time/timer.c:1798 [inline] > __run_timers kernel/time/timer.c:2372 [inline] > __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 > run_timer_base kernel/time/timer.c:2393 [inline] > run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 > handle_softirqs+0x283/0x870 kernel/softirq.c:579 > __do_softirq kernel/softirq.c:613 [inline] > invoke_softirq kernel/softirq.c:453 [inline] > __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 > </IRQ> > <TASK> > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 > RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70 kernel/kcov.c:222 > Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 1c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 > RSP: 0018:ffffc90003007658 EFLAGS: 00000246 > RAX: ffffffff8b72d1aa RBX: ffffc900030077c0 RCX: ffff88802acd3c00 > RDX: ffffc9000d3ed000 RSI: 000000000007ffff RDI: ffffffff8be33f20 > RBP: ffffc90003007790 R08: 0000000000000000 R09: ffffffff8b72d15c > R10: dffffc0000000000 R11: fffffbfff1f47507 R12: dffffc0000000000 > R13: 1ffff92000600ed4 R14: 0000000000000001 R15: ffffc900030076c0 > rcu_read_lock include/linux/rcupdate.h:842 [inline] > mt_find+0x1aa/0x5f0 lib/maple_tree.c:6931 > find_vma+0xe7/0x160 mm/mmap.c:909 > lock_mm_and_find_vma+0x5f/0x300 mm/mmap_lock.c:340 > do_user_addr_fault+0x331/0x1390 arch/x86/mm/fault.c:1359 > handle_page_fault arch/x86/mm/fault.c:1476 [inline] > exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 > asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 > RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60 > Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 8d 0a 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 > RSP: 0018:ffffc90003007a18 EFLAGS: 00050206 > RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038 > RDX: 0000000000000001 RSI: 0000200000297000 RDI: ffffc90003007aa0 > RBP: ffffc90003007c30 R08: ffffc90003007ad7 R09: 1ffff92000600f5a > R10: dffffc0000000000 R11: fffff52000600f5b R12: 0000000000000002 > R13: dffffc0000000000 R14: ffffc90003007aa0 R15: 0000200000297000 > copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] > raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] > _inline_copy_from_user include/linux/uaccess.h:178 [inline] > _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 > copy_from_user include/linux/uaccess.h:212 [inline] > copy_msghdr_from_user net/socket.c:2544 [inline] > recvmsg_copy_msghdr net/socket.c:2800 [inline] > ___sys_recvmsg+0x12e/0x510 net/socket.c:2872 > do_recvmmsg+0x307/0x770 net/socket.c:2971 > __sys_recvmmsg net/socket.c:3045 [inline] > __do_sys_recvmmsg net/socket.c:3068 [inline] > __se_sys_recvmmsg net/socket.c:3061 [inline] > __x64_sys_recvmmsg+0x190/0x240 net/socket.c:3061 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f873778eec9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f87359f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b > RAX: ffffffffffffffda RBX: 00007f87379e6090 RCX: 00007f873778eec9 > RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 > RBP: 00007f8737811f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f87379e6128 R14: 00007f87379e6090 R15: 00007f8737b0fa28 > </TASK> > > Allocated by task 5950: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:388 [inline] > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 > kasan_kmalloc include/linux/kasan.h:260 [inline] > __do_kmalloc_node mm/slub.c:4376 [inline] > __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4388 > kmalloc_noprof include/linux/slab.h:909 [inline] > usb_alloc_urb+0x46/0x150 drivers/usb/core/urb.c:75 > snd_usbmidi_in_endpoint_create+0xb4/0xa30 sound/usb/midi.c:1348 > snd_usbmidi_create_endpoints_midiman sound/usb/midi.c:2363 [inline] > __snd_usbmidi_create+0x2223/0x2a70 sound/usb/midi.c:2646 > snd_usb_midi_v2_create+0x43e6/0x4660 sound/usb/midi2.c:1178 > usb_audio_probe+0xb78/0x1e10 sound/usb/card.c:976 > usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x26a/0x9e0 drivers/base/dd.c:659 > __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 > driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 > __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 > bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 > __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 > bus_probe_device+0x185/0x260 drivers/base/bus.c:537 > device_add+0x7b6/0xb50 drivers/base/core.c:3689 > usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210 > usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 > usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x26a/0x9e0 drivers/base/dd.c:659 > __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 > driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 > __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 > bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 > __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 > bus_probe_device+0x185/0x260 drivers/base/bus.c:537 > device_add+0x7b6/0xb50 drivers/base/core.c:3689 > usb_new_device+0xa39/0x16f0 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+0x2958/0x4a20 drivers/usb/core/hub.c:5952 > process_one_work kernel/workqueue.c:3236 [inline] > process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Freed by task 5950: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 > poison_slab_object mm/kasan/common.c:243 [inline] > __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 > kasan_slab_free include/linux/kasan.h:233 [inline] > slab_free_hook mm/slub.c:2422 [inline] > slab_free mm/slub.c:4695 [inline] > kfree+0x18e/0x440 mm/slub.c:4894 > free_urb_and_buffer sound/usb/midi.c:1309 [inline] > snd_usbmidi_in_endpoint_delete+0xde/0x680 sound/usb/midi.c:1322 > snd_usbmidi_free sound/usb/midi.c:1530 [inline] > snd_usbmidi_rawmidi_free+0xae/0x160 sound/usb/midi.c:1591 > snd_rawmidi_free+0x3bc/0x410 sound/core/rawmidi.c:1934 > snd_rawmidi_dev_free+0x38/0x50 sound/core/rawmidi.c:1945 > __snd_device_free+0x1d2/0x2e0 sound/core/device.c:76 > snd_device_free_all+0xcf/0x180 sound/core/device.c:233 > snd_card_do_free sound/core/init.c:587 [inline] > release_card_device+0x75/0x1b0 sound/core/init.c:153 > device_release+0x9c/0x1c0 drivers/base/core.c:-1 > kobject_cleanup lib/kobject.c:689 [inline] > kobject_release lib/kobject.c:720 [inline] > kref_put include/linux/kref.h:65 [inline] > kobject_put+0x22b/0x480 lib/kobject.c:737 > snd_card_free_when_closed sound/core/init.c:618 [inline] > snd_card_free+0x110/0x190 sound/core/init.c:650 > usb_audio_probe+0x193f/0x1e10 sound/usb/card.c:1034 > usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x26a/0x9e0 drivers/base/dd.c:659 > __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 > driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 > __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 > bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 > __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 > bus_probe_device+0x185/0x260 drivers/base/bus.c:537 > device_add+0x7b6/0xb50 drivers/base/core.c:3689 > usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210 > usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 > usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x26a/0x9e0 drivers/base/dd.c:659 > __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 > driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 > __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 > bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 > __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 > bus_probe_device+0x185/0x260 drivers/base/bus.c:537 > device_add+0x7b6/0xb50 drivers/base/core.c:3689 > usb_new_device+0xa39/0x16f0 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+0x2958/0x4a20 drivers/usb/core/hub.c:5952 > process_one_work kernel/workqueue.c:3236 [inline] > process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > The buggy address belongs to the object at ffff8880310f9a00 > which belongs to the cache kmalloc-192 of size 192 > The buggy address is located 16 bytes inside of > freed 192-byte region [ffff8880310f9a00, ffff8880310f9ac0) > > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x310f9 > anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) > page_type: f5(slab) > raw: 00fff00000000000 ffff88801a4413c0 0000000000000000 dead000000000001 > raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 19362280210, free_ts 19332206122 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 > prep_new_page mm/page_alloc.c:1859 [inline] > get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 > __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 > alloc_slab_page mm/slub.c:2492 [inline] > allocate_slab+0x8a/0x370 mm/slub.c:2660 > new_slab mm/slub.c:2714 [inline] > ___slab_alloc+0xbeb/0x1420 mm/slub.c:3901 > __slab_alloc mm/slub.c:3992 [inline] > __slab_alloc_node mm/slub.c:4067 [inline] > slab_alloc_node mm/slub.c:4228 [inline] > __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4402 > kmalloc_noprof include/linux/slab.h:905 [inline] > kzalloc_noprof include/linux/slab.h:1039 [inline] > call_usermodehelper_setup+0x8e/0x270 kernel/umh.c:362 > kobject_uevent_env+0x65c/0x8c0 lib/kobject_uevent.c:628 > kernel_add_sysfs_param+0xb1/0xe0 kernel/params.c:816 > param_sysfs_builtin+0x18a/0x230 kernel/params.c:851 > param_sysfs_builtin_init+0x23/0x30 kernel/params.c:987 > do_one_initcall+0x233/0x820 init/main.c:1269 > do_initcall_level+0x104/0x190 init/main.c:1331 > do_initcalls+0x59/0xa0 init/main.c:1347 > kernel_init_freeable+0x334/0x4b0 init/main.c:1579 > page last free pid 980 tgid 980 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1395 [inline] > __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 > vfree+0x25a/0x400 mm/vmalloc.c:3434 > delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3353 > process_one_work kernel/workqueue.c:3236 [inline] > process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Memory state around the buggy address: > ffff8880310f9900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880310f9980: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >ffff8880310f9a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8880310f9a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8880310f9b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ================================================================== > ---------------- > Code disassembly (best guess): > 0: ff 00 incl (%rax) > 2: 74 11 je 0x15 > 4: 81 fa 00 01 00 00 cmp $0x100,%edx > a: 75 35 jne 0x41 > c: 83 b9 3c 16 00 00 00 cmpl $0x0,0x163c(%rcx) > 13: 74 2c je 0x41 > 15: 8b 91 18 16 00 00 mov 0x1618(%rcx),%edx > 1b: 83 fa 02 cmp $0x2,%edx > 1e: 75 21 jne 0x41 > 20: 48 8b 91 20 16 00 00 mov 0x1620(%rcx),%rdx > 27: 48 8b 32 mov (%rdx),%rsi > * 2a: 48 8d 7e 01 lea 0x1(%rsi),%rdi <-- trapping instruction > 2e: 8b 89 1c 16 00 00 mov 0x161c(%rcx),%ecx > 34: 48 39 cf cmp %rcx,%rdi > 37: 73 08 jae 0x41 > 39: 48 89 3a mov %rdi,(%rdx) > 3c: 48 rex.W > 3d: 89 .byte 0x89 > 3e: 44 rex.R > 3f: f2 repnz > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@...glegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup #syz fix: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
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