================================================================== BUG: KASAN: slab-use-after-free in force_wakeup_write+0x14d/0x170 drivers/bluetooth/hci_vhci.c:188 Read of size 1 at addr ffff888031a28a31 by task syz.6.1361/12057 CPU: 1 UID: 0 PID: 12057 Comm: syz.6.1361 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 force_wakeup_write+0x14d/0x170 drivers/bluetooth/hci_vhci.c:188 full_proxy_write+0xfb/0x1b0 fs/debugfs/file.c:356 vfs_write+0x24c/0x1150 fs/read_write.c:677 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7534185d29 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7535036038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7534375fa0 RCX: 00007f7534185d29 RDX: 0000000000000001 RSI: 0000000020001780 RDI: 000000000000000f RBP: 00007f7534201b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7534375fa0 R15: 00007ffd563580e8 Allocated by task 11863: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_node_noprof+0x21f/0x520 mm/slub.c:4304 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:650 kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline] io_alloc_cache_init io_uring/alloc_cache.h:37 [inline] io_ring_ctx_alloc io_uring/io_uring.c:318 [inline] io_uring_create io_uring/io_uring.c:3638 [inline] io_uring_setup+0x642/0x3230 io_uring/io_uring.c:3811 __do_sys_io_uring_setup io_uring/io_uring.c:3838 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3832 [inline] __x64_sys_io_uring_setup+0x98/0x140 io_uring/io_uring.c:3832 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3567: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 kvfree+0x47/0x50 mm/util.c:693 io_alloc_cache_free io_uring/alloc_cache.h:58 [inline] io_alloc_cache_free io_uring/alloc_cache.h:47 [inline] io_ring_ctx_free io_uring/io_uring.c:2735 [inline] io_ring_exit_work+0x8a9/0x1b20 io_uring/io_uring.c:2968 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888031a28800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 561 bytes inside of freed 1024-byte region [ffff888031a28800, ffff888031a28c00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31a28 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000c68a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 18359725110, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __kmalloc_cache_noprof+0xf6/0x420 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] bus_register+0x4f/0x6a0 drivers/base/bus.c:860 subsys_register drivers/base/bus.c:1216 [inline] subsys_system_register+0x24/0x60 drivers/base/bus.c:1281 mcheck_init_device+0x1de/0x300 arch/x86/kernel/cpu/mce/core.c:2863 do_one_initcall+0x128/0x630 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x58f/0x8b0 init/main.c:1577 kernel_init+0x1c/0x2b0 init/main.c:1466 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page_owner free stack trace missing Memory state around the buggy address: ffff888031a28900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031a28980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888031a28a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888031a28a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031a28b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================