================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3ab9/0x5660 kernel/locking/lockdep.c:4923 Read of size 8 at addr ffff88807bad44a8 by task syz-executor.3/11856 CPU: 1 PID: 11856 Comm: syz-executor.3 Not tainted 5.18.0-syzkaller-13842-g952923ddc011 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 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 __lock_acquire+0x3ab9/0x5660 kernel/locking/lockdep.c:4923 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 remove_wait_queue+0x1d/0x180 kernel/sched/wait.c:54 snd_rawmidi_write+0x489/0xb90 sound/core/rawmidi.c:1543 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x1e8/0x250 fs/read_write.c:644 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+0x46/0xb0 RIP: 0033:0x7fa463489109 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa4645d6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa46359bf60 RCX: 00007fa463489109 RDX: 00000000fffffd2c RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007fa4634e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe9147111f R14: 00007fa4645d6300 R15: 0000000000022000 Allocated by task 11856: 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 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] snd_rawmidi_runtime_create sound/core/rawmidi.c:148 [inline] open_substream+0xe9/0x8b0 sound/core/rawmidi.c:306 rawmidi_open_priv+0x591/0x6f0 sound/core/rawmidi.c:357 snd_rawmidi_open+0x49f/0xb60 sound/core/rawmidi.c:455 snd_open+0x21f/0x460 sound/core/sound.c:169 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4a1/0x11f0 fs/open.c:848 do_open fs/namei.c:3520 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3653 do_filp_open+0x1aa/0x400 fs/namei.c:3680 do_sys_openat2+0x16d/0x4c0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1305 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+0x46/0xb0 Freed by task 11855: 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:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xd6/0x4d0 mm/slub.c:4555 snd_rawmidi_runtime_free sound/core/rawmidi.c:177 [inline] close_substream.part.0+0x18d/0x720 sound/core/rawmidi.c:528 close_substream sound/core/rawmidi.c:507 [inline] rawmidi_release_priv+0x192/0x270 sound/core/rawmidi.c:547 snd_rawmidi_release+0x5e/0xf0 sound/core/rawmidi.c:578 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 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+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88807bad4400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 168 bytes inside of 512-byte region [ffff88807bad4400, ffff88807bad4600) The buggy address belongs to the physical page: page:ffffea0001eeb500 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807bad7c00 pfn:0x7bad4 head:ffffea0001eeb500 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e2c608 ffffea00007cae08 ffff888011841c80 raw: ffff88807bad7c00 0000000000100007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11643, tgid 11633 (syz-executor.2), ts 508938890220, free_ts 506835541506 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 __alloc_pages_node include/linux/gfp.h:587 [inline] alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x80/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] kmem_cache_alloc_node_trace+0x185/0x420 mm/slub.c:3278 kmalloc_node include/linux/slab.h:618 [inline] kzalloc_node include/linux/slab.h:744 [inline] create_io_worker+0x108/0x630 fs/io-wq.c:814 io_wqe_create_worker fs/io-wq.c:308 [inline] io_wqe_enqueue+0x6cc/0xbd0 fs/io-wq.c:949 io_queue_iowq+0x262/0x650 fs/io_uring.c:2083 io_queue_async+0x19e/0x220 fs/io_uring.c:8779 io_queue_sqe fs/io_uring.c:8807 [inline] io_submit_sqe fs/io_uring.c:9058 [inline] io_submit_sqes+0x629e/0x8000 fs/io_uring.c:9169 __do_sys_io_uring_enter+0x1112/0x2300 fs/io_uring.c:12101 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+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __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:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] kmem_cache_alloc_node_trace+0x2af/0x420 mm/slub.c:3278 kmalloc_node include/linux/slab.h:618 [inline] kzalloc_node include/linux/slab.h:744 [inline] create_io_worker+0x108/0x630 fs/io-wq.c:814 io_wqe_create_worker fs/io-wq.c:308 [inline] io_wqe_enqueue+0x6cc/0xbd0 fs/io-wq.c:949 io_queue_iowq+0x262/0x650 fs/io_uring.c:2083 io_queue_async+0x19e/0x220 fs/io_uring.c:8779 io_queue_sqe fs/io_uring.c:8807 [inline] io_submit_sqe fs/io_uring.c:9058 [inline] io_submit_sqes+0x629e/0x8000 fs/io_uring.c:9169 __do_sys_io_uring_enter+0x1112/0x2300 fs/io_uring.c:12101 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+0x46/0xb0 Memory state around the buggy address: ffff88807bad4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807bad4400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807bad4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807bad4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bad4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================