================================================================== BUG: KASAN: use-after-free in __snd_rawmidi_transmit_peek+0x1ae/0x270 sound/core/rawmidi.c:1286 Read of size 1 at addr ffff88806c196075 by task kworker/0:1H/9 CPU: 0 PID: 9 Comm: kworker/0:1H Not tainted 5.18.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_highpri snd_usbmidi_out_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 __snd_rawmidi_transmit_peek+0x1ae/0x270 sound/core/rawmidi.c:1286 snd_rawmidi_transmit+0x77/0xc0 sound/core/rawmidi.c:1411 snd_usbmidi_standard_output+0x1f3/0xc30 sound/usb/midi.c:650 snd_usbmidi_do_output+0x1cb/0x410 sound/usb/midi.c:311 process_one_work+0x841/0x13a0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 4700: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kvmalloc include/linux/slab.h:731 [inline] kvzalloc include/linux/slab.h:739 [inline] snd_rawmidi_runtime_create sound/core/rawmidi.c:162 [inline] open_substream+0x2eb/0x7e0 sound/core/rawmidi.c:306 rawmidi_open_priv+0x39a/0x580 sound/core/rawmidi.c:357 snd_rawmidi_kernel_open+0x151/0x200 sound/core/rawmidi.c:392 midisynth_use+0xe8/0x240 sound/core/seq/seq_midi.c:215 subscribe_port sound/core/seq/seq_ports.c:412 [inline] check_and_subscribe_port+0x69c/0xbe0 sound/core/seq/seq_ports.c:495 snd_seq_port_connect+0x330/0x500 sound/core/seq/seq_ports.c:581 snd_seq_ioctl_subscribe_port+0x1cc/0x3a0 sound/core/seq/seq_clientmgr.c:1492 snd_seq_oss_midi_open+0x453/0x590 sound/core/seq/oss/seq_oss_midi.c:359 snd_seq_oss_synth_setup_midi+0xff/0x4e0 sound/core/seq/oss/seq_oss_synth.c:269 snd_seq_oss_open+0x6f4/0x8e0 sound/core/seq/oss/seq_oss_init.c:260 odev_open+0x5d/0x80 sound/core/seq/oss/seq_oss.c:128 chrdev_open+0x20f/0x650 fs/char_dev.c:414 do_dentry_open+0x414/0xfd0 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x9cf/0x2360 fs/namei.c:3609 do_filp_open+0x199/0x3d0 fs/namei.c:3636 do_sys_openat2+0x11e/0x3f0 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 4700: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd6/0x4d0 mm/slub.c:4552 snd_rawmidi_runtime_free sound/core/rawmidi.c:176 [inline] close_substream.part.0+0x161/0x5c0 sound/core/rawmidi.c:528 close_substream sound/core/rawmidi.c:507 [inline] rawmidi_release_priv+0x131/0x210 sound/core/rawmidi.c:547 snd_rawmidi_kernel_release+0x29/0xa0 sound/core/rawmidi.c:564 unsubscribe_port sound/core/seq/seq_ports.c:437 [inline] __delete_and_unsubscribe_port+0x203/0x450 sound/core/seq/seq_ports.c:537 snd_seq_port_disconnect+0x34b/0x710 sound/core/seq/seq_ports.c:616 snd_seq_ioctl_unsubscribe_port+0x1cc/0x3a0 sound/core/seq/seq_clientmgr.c:1537 snd_seq_oss_midi_close+0x39d/0x420 sound/core/seq/oss/seq_oss_midi.c:404 snd_seq_oss_synth_reset+0x372/0xa30 sound/core/seq/oss/seq_oss_synth.c:406 snd_seq_oss_reset+0x5a/0x210 sound/core/seq/oss/seq_oss_init.c:435 snd_seq_oss_release+0x75/0x170 sound/core/seq/oss/seq_oss_init.c:412 odev_release+0x45/0x70 sound/core/seq/oss/seq_oss.c:144 __fput+0x1f5/0x8c0 fs/file_table.c:317 task_work_run+0xc0/0x160 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88806c196000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 117 bytes inside of 4096-byte region [ffff88806c196000, ffff88806c197000) The buggy address belongs to the physical page: page:ffffea0001b06400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6c190 head:ffffea0001b06400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001b1e800 dead000000000002 ffff88800fc42140 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 4083, tgid 4083 (udevd), ts 488959580126, free_ts 488746851456 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x178d/0x3dc0 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8e1/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc+0x318/0x350 mm/slub.c:4410 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0xb0/0x6d0 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1f8/0x360 security/tomoyo/file.c:822 security_inode_getattr+0xab/0x100 security/security.c:1350 vfs_getattr fs/stat.c:157 [inline] vfs_statx+0xf4/0x2e0 fs/stat.c:232 vfs_fstatat+0x4f/0x70 fs/stat.c:255 __do_sys_newfstatat+0x72/0xd0 fs/stat.c:425 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc+0x200/0x350 mm/slub.c:4410 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:714 [inline] usb_get_configuration+0xeb/0x3570 drivers/usb/core/config.c:882 usb_enumerate_device drivers/usb/core/hub.c:2398 [inline] usb_new_device+0x559/0x800 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5363 [inline] hub_port_connect_change drivers/usb/core/hub.c:5507 [inline] port_event drivers/usb/core/hub.c:5665 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5747 process_one_work+0x841/0x13a0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Memory state around the buggy address: ffff88806c195f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806c195f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806c196000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806c196080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806c196100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================