usb 1-1: USB disconnect, device number 5 ================================================================== BUG: KASAN: slab-use-after-free in free_all_midi2_umps sound/usb/midi2.c:707 [inline] BUG: KASAN: slab-use-after-free in snd_usb_midi_v2_free+0x602/0x7b0 sound/usb/midi2.c:945 Write of size 8 at addr ffff88807d4f8358 by task syz.4.15148/30397 CPU: 1 PID: 30397 Comm: syz.4.15148 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 free_all_midi2_umps sound/usb/midi2.c:707 [inline] snd_usb_midi_v2_free+0x602/0x7b0 sound/usb/midi2.c:945 snd_usb_midi_v2_free_all+0x67/0x90 sound/usb/midi2.c:1245 snd_usb_audio_free+0x4c/0x100 sound/usb/card.c:494 snd_card_do_free sound/core/init.c:601 [inline] release_card_device+0x9f/0x1a0 sound/core/init.c:153 device_release+0xbc/0x1e0 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+0x21b/0x450 lib/kobject.c:737 usb_audio_disconnect+0x60c/0x700 sound/usb/card.c:1007 usb_unbind_interface+0x207/0x870 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:628 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x458/0x6f0 drivers/base/dd.c:1374 bus_remove_device+0x43b/0x520 drivers/base/bus.c:624 device_del+0x51f/0x910 drivers/base/core.c:3889 usb_disable_device+0x3ee/0x8a0 drivers/usb/core/message.c:1474 usb_disconnect+0x340/0x8a0 drivers/usb/core/hub.c:2315 hub_quiesce+0x171/0x330 drivers/usb/core/hub.c:1379 hub_disconnect+0xc6/0x450 drivers/usb/core/hub.c:1785 usb_unbind_interface+0x207/0x870 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:628 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x458/0x6f0 drivers/base/dd.c:1374 proc_ioctl+0x287/0x630 drivers/usb/core/devio.c:2357 proc_ioctl_default+0xc5/0x110 drivers/usb/core/devio.c:2400 usbdev_do_ioctl drivers/usb/core/devio.c:2756 [inline] usbdev_ioctl+0x1389/0x2070 drivers/usb/core/devio.c:2816 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe802d9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe803c71028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe803025fa0 RCX: 00007fe802d9e0d9 RDX: 0000200000000200 RSI: 00000000c0105512 RDI: 0000000000000009 RBP: 00007fe802e35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe803026038 R14: 00007fe803025fa0 R15: 00007ffe5260dee8 Allocated by task 8: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] snd_ump_endpoint_new+0x7d/0x3a0 sound/core/ump.c:137 create_midi2_ump+0x314/0x7b0 sound/usb/midi2.c:735 find_matching_ep_partner sound/usb/midi2.c:799 [inline] parse_midi_2_0 sound/usb/midi2.c:977 [inline] snd_usb_midi_v2_create+0x1382/0x48a0 sound/usb/midi2.c:1134 snd_usb_create_stream+0x262/0x5d0 sound/usb/card.c:182 snd_usb_create_streams sound/usb/card.c:282 [inline] usb_audio_probe+0xead/0x1f00 sound/usb/card.c:893 usb_probe_interface+0x5c2/0xaf0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x247/0xae0 drivers/base/dd.c:717 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109 bus_probe_device+0x180/0x260 drivers/base/bus.c:580 device_add+0x87c/0xc40 drivers/base/core.c:3700 usb_set_configuration+0x1ad0/0x2150 drivers/usb/core/message.c:2265 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x12a/0x260 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x247/0xae0 drivers/base/dd.c:717 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109 bus_probe_device+0x180/0x260 drivers/base/bus.c:580 device_add+0x87c/0xc40 drivers/base/core.c:3700 usb_new_device+0x995/0x1550 drivers/usb/core/hub.c:2660 hub_port_connect drivers/usb/core/hub.c:5529 [inline] hub_port_connect_change drivers/usb/core/hub.c:5669 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x29d5/0x4a80 drivers/usb/core/hub.c:5915 process_one_work kernel/workqueue.c:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Freed by task 30397: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] __kmem_cache_free+0xba/0x1f0 mm/slub.c:3843 snd_rawmidi_free+0x3f2/0x410 sound/core/rawmidi.c:1996 snd_rawmidi_dev_free+0x38/0x40 sound/core/rawmidi.c:2005 __snd_device_free+0x1cd/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:599 [inline] release_card_device+0x6f/0x1a0 sound/core/init.c:153 device_release+0xbc/0x1e0 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+0x21b/0x450 lib/kobject.c:737 usb_audio_disconnect+0x60c/0x700 sound/usb/card.c:1007 usb_unbind_interface+0x207/0x870 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:628 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x458/0x6f0 drivers/base/dd.c:1374 bus_remove_device+0x43b/0x520 drivers/base/bus.c:624 device_del+0x51f/0x910 drivers/base/core.c:3889 usb_disable_device+0x3ee/0x8a0 drivers/usb/core/message.c:1474 usb_disconnect+0x340/0x8a0 drivers/usb/core/hub.c:2315 hub_quiesce+0x171/0x330 drivers/usb/core/hub.c:1379 hub_disconnect+0xc6/0x450 drivers/usb/core/hub.c:1785 usb_unbind_interface+0x207/0x870 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:628 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x458/0x6f0 drivers/base/dd.c:1374 proc_ioctl+0x287/0x630 drivers/usb/core/devio.c:2357 proc_ioctl_default+0xc5/0x110 drivers/usb/core/devio.c:2400 usbdev_do_ioctl drivers/usb/core/devio.c:2756 [inline] usbdev_ioctl+0x1389/0x2070 drivers/usb/core/devio.c:2816 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88807d4f8000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 856 bytes inside of freed 4096-byte region [ffff88807d4f8000, ffff88807d4f9000) The buggy address belongs to the physical page: page:ffffea0001f53e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d4f8 head:ffffea0001f53e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017c42140 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5140, tgid 5140 (udevd), ts 249153585935, free_ts 248396458853 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa7/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] tomoyo_realpath_from_path+0xe6/0x5c0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x282/0x560 security/tomoyo/file.c:822 security_inode_getattr+0xd3/0x120 security/security.c:2190 vfs_getattr fs/stat.c:173 [inline] vfs_fstat fs/stat.c:198 [inline] __do_sys_newfstat fs/stat.c:473 [inline] __se_sys_newfstat fs/stat.c:470 [inline] __x64_sys_newfstat+0x12c/0x250 fs/stat.c:470 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 __slab_free+0x35a/0x400 mm/slub.c:3736 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 slab_alloc_node mm/slub.c:3495 [inline] __kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534 kmalloc_node_trace+0x26/0xe0 mm/slab_common.c:1111 kmalloc_node include/linux/slab.h:616 [inline] kzalloc_node include/linux/slab.h:732 [inline] __get_vm_area_node+0x125/0x370 mm/vmalloc.c:2613 __vmalloc_node_range+0x36f/0x1320 mm/vmalloc.c:3299 __vmalloc_node mm/vmalloc.c:3404 [inline] vzalloc+0x79/0x90 mm/vmalloc.c:3477 alloc_counters+0xcb/0x6c0 net/ipv4/netfilter/ip_tables.c:799 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1037 [inline] do_ip6t_get_ctl+0xad5/0x1220 net/ipv6/netfilter/ip6_tables.c:1674 nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x233/0x2e0 net/ipv6/ipv6_sockglue.c:1499 Memory state around the buggy address: ffff88807d4f8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d4f8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d4f8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d4f8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d4f8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================