================================================================== 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 ffff8881d3c5b1e0 by task syz-executor.2/358 CPU: 0 PID: 358 Comm: syz-executor.2 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:_raw_spin_unlock_irq+0x27/0x30 kernel/locking/spinlock.c:200 Code: 44 00 00 55 48 8b 74 24 08 48 89 fd 48 8d 7f 18 e8 8e 7f 76 fb 48 89 ef e8 26 6c 77 fb e8 71 15 95 fb fb 65 ff 0d a9 2a 52 7a <5d> c3 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 RSP: 0018:ffff8881adb27b50 EFLAGS: 00000282 RAX: 0000000000000000 RBX: ffff8881cfb89900 RCX: 1ffffffff1014c62 RDX: 1ffff11039f71427 RSI: 0000000000000000 RDI: ffff8881cfb8a138 RBP: ffff8881db232ac0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881db232ac0 R13: ffffffff8722f840 R14: ffff8881d2602880 R15: 0000000000000000 finish_lock_switch kernel/sched/core.c:3169 [inline] finish_task_switch+0x11d/0x5d0 kernel/sched/core.c:3269 context_switch kernel/sched/core.c:3433 [inline] __schedule+0x892/0x1cb0 kernel/sched/core.c:4155 schedule+0xcd/0x2b0 kernel/sched/core.c:4230 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x1b1/0x660 kernel/time/hrtimer.c:1879 hrtimer_nanosleep+0x1f6/0x430 kernel/time/hrtimer.c:1932 __do_sys_nanosleep kernel/time/hrtimer.c:1966 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1953 [inline] __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1953 do_syscall_64+0x50/0x90 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45b010 Code: Bad RIP value. RSP: 002b:00007ffc0daf0d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000006276c RCX: 000000000045b010 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffc0daf0d10 RBP: 0000000000000142 R08: 0000000000000001 R09: 0000000001ed7940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000018 R13: 00007ffc0daf0d60 R14: 0000000000061fbd R15: 00007ffc0daf0d70 Allocated by task 68: 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 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x82b/0x1120 kernel/workqueue.c:2417 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Freed by task 357: 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 __vunmap+0x8f3/0xb70 mm/vmalloc.c:2310 __vfree mm/vmalloc.c:2351 [inline] vfree+0x88/0x140 mm/vmalloc.c:2381 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:883 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x71f/0x910 net/ipv6/netfilter/ip6_tables.c:1709 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1bf/0x270 net/ipv6/ipv6_sockglue.c:1468 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3893 __sys_getsockopt+0x135/0x210 net/socket.c:2172 __do_sys_getsockopt net/socket.c:2187 [inline] __se_sys_getsockopt net/socket.c:2184 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2184 do_syscall_64+0x50/0x90 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881d3c5b180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 32 bytes to the right of 64-byte region [ffff8881d3c5b180, ffff8881d3c5b1c0) The buggy address belongs to the page: page:ffffea00074f16c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007316580 0000000f0000000f ffff8881da003180 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d3c5b080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8881d3c5b100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff8881d3c5b180: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881d3c5b200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881d3c5b280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================