================================================================== BUG: KASAN: slab-out-of-bounds in snd_usb_mixer_notify_id+0x219/0x2a0 sound/usb/mixer.c:3240 Write of size 4 at addr ffff8881d27da460 by task syz-executor.4/357 CPU: 1 PID: 357 Comm: syz-executor.4 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf6/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x1a/0x210 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x37/0x7c mm/kasan/report.c:530 snd_usb_mixer_notify_id+0x219/0x2a0 sound/usb/mixer.c:3240 snd_usb_mixer_interrupt+0x24f/0xbd0 sound/usb/mixer.c:3379 __usb_hcd_giveback_urb+0x32d/0x560 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1716 dummy_timer+0x11f2/0x3240 drivers/usb/gadget/udc/dummy_hcd.c:1967 call_timer_fn+0x1ac/0x6e0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers.part.0+0x54c/0x9e0 kernel/time/timer.c:1773 __run_timers kernel/time/timer.c:1745 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1786 __do_softirq+0x222/0x95b kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0xed/0x140 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu kernel/softirq.c:417 [inline] irq_exit_rcu+0x150/0x1f0 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x115/0x1c0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218 Code: 05 16 a5 c2 7e 65 48 8b 34 25 40 ef 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 34 13 00 00 85 c0 74 4f 8b 86 10 13 00 00 <83> f8 03 75 44 48 8b 86 18 13 00 00 8b b6 14 13 00 00 4c 8b 00 48 RSP: 0018:ffff8881adb3fb10 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81148e34 RDX: 0000000000000000 RSI: ffff8881adadb200 RDI: 0000000000000005 RBP: ffff8881adb3fd1c R08: 0000000000000001 R09: ffffffff87209083 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881ad321900 R15: ffff8881ad321d2c wait_task_continued kernel/exit.c:1215 [inline] wait_consider_task+0xdb4/0x3b30 kernel/exit.c:1361 do_wait_thread kernel/exit.c:1378 [inline] do_wait+0x36a/0x9b0 kernel/exit.c:1449 kernel_wait4+0x14c/0x260 kernel/exit.c:1621 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633 do_syscall_64+0x50/0x90 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4169ba Code: Bad RIP value. RSP: 002b:00007fff87471878 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 000000000032145b RCX: 00000000004169ba RDX: 0000000040000001 RSI: 00007fff874718b0 RDI: ffffffffffffffff RBP: 0000000000000c48 R08: 0000000000000001 R09: 0000000002c03940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff874718b0 R14: 000000000032145b R15: 00007fff874718c0 Allocated by task 3241: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] add_single_ctl_with_resume+0x53/0x1d0 sound/usb/mixer_quirks.c:147 snd_mbox1_create_sync_switch sound/usb/mixer_quirks.c:719 [inline] snd_usb_mixer_apply_create_quirk+0x14d9/0x1fd0 sound/usb/mixer_quirks.c:2654 snd_usb_create_mixer+0x7d5/0x1950 sound/usb/mixer.c:3538 create_standard_mixer_quirk+0x57/0x70 sound/usb/quirks.c:508 snd_usb_create_quirk sound/usb/quirks.c:563 [inline] create_composite_quirk+0x242/0x4b0 sound/usb/quirks.c:48 snd_usb_create_quirk+0x9f/0xd0 sound/usb/quirks.c:563 usb_audio_probe+0xa53/0x2290 sound/usb/card.c:674 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374 really_probe+0x291/0xc90 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1b40 drivers/base/core.c:2680 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272 really_probe+0x291/0xc90 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1b40 drivers/base/core.c:2680 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5208 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Freed by task 6140: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x116/0x160 mm/kasan/common.c:455 slab_free_hook mm/slub.c:1474 [inline] slab_free_freelist_hook+0x53/0x140 mm/slub.c:1507 slab_free mm/slub.c:3072 [inline] kfree+0xbc/0x2c0 mm/slub.c:4063 kobject_uevent_env+0x2a5/0x1540 lib/kobject_uevent.c:624 usb_gadget_remove_driver+0x2e/0x350 drivers/usb/gadget/udc/core.c:1297 usb_gadget_unregister_driver+0xe7/0x370 drivers/usb/gadget/udc/core.c:1440 raw_release+0x18a/0x290 drivers/usb/gadget/legacy/raw_gadget.c:400 __fput+0x339/0x870 fs/file_table.c:281 task_work_run+0xdd/0x1a0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x19e/0x1a0 arch/x86/entry/common.c:246 do_syscall_64+0x5c/0x90 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881d27da400 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 32 bytes to the right of 64-byte region [ffff8881d27da400, ffff8881d27da440) The buggy address belongs to the page: page:ffffea000749f680 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881d27da480 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea00075182c0 0000001100000011 ffff8881da003180 raw: ffff8881d27da480 000000008020001f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d27da300: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff8881d27da380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881d27da400: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881d27da480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881d27da500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================