================================================================== BUG: KASAN: slab-use-after-free in msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222 Read of size 2 at addr ffff8881427be232 by task syz.5.2401/17204 CPU: 0 UID: 0 PID: 17204 Comm: syz.5.2401 Tainted: G U 6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0 Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222 simple_attr_read+0x169/0x370 fs/libfs.c:1334 debugfs_attr_read+0x76/0xa0 fs/debugfs/file.c:534 full_proxy_read+0x13c/0x200 fs/debugfs/file.c:393 vfs_read+0x1df/0xbf0 fs/read_write.c:563 ksys_read+0x12b/0x250 fs/read_write.c:708 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: 0033:0x7fdf77f8cde9 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:00007fdf78d1b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fdf781a5fa0 RCX: 00007fdf77f8cde9 RDX: 000000000000ffff RSI: 0000400000006740 RDI: 0000000000000004 RBP: 00007fdf7800e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdf781a5fa0 R15: 00007ffefa99d318 Allocated by task 17148: 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 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] rxrpc_service_prealloc+0xda/0x1a0 net/rxrpc/call_accept.c:166 rxrpc_listen+0x227/0x330 net/rxrpc/af_rxrpc.c:236 afs_open_socket+0x269/0x380 fs/afs/rxrpc.c:90 afs_net_init+0x95d/0xc60 fs/afs/main.c:123 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138 setup_net+0x21f/0x860 net/core/net_namespace.c:362 copy_net_ns+0x2b4/0x6c0 net/core/net_namespace.c:516 create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x45d/0xa40 kernel/fork.c:3342 __do_sys_unshare kernel/fork.c:3413 [inline] __se_sys_unshare kernel/fork.c:3411 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3411 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 2946: 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:576 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:4609 [inline] kfree+0x2c4/0x4d0 mm/slub.c:4757 rxrpc_discard_prealloc+0x717/0x930 net/rxrpc/call_accept.c:235 rxrpc_listen+0x117/0x330 net/rxrpc/af_rxrpc.c:246 afs_close_socket+0x97/0x340 fs/afs/rxrpc.c:113 afs_net_exit+0x93/0x130 fs/afs/main.c:155 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:172 cleanup_net+0x5c6/0xbf0 net/core/net_namespace.c:652 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8881427be000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 562 bytes inside of freed 1024-byte region [ffff8881427be000, ffff8881427be400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1427b8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 057ff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 057ff00000000003 ffffea000509ee01 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 8688718744, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x23d/0x330 mm/slub.c:2640 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] class_register+0xb5/0x460 drivers/base/class.c:197 do_one_initcall+0x128/0x700 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c7/0x900 init/main.c:1568 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 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: ffff8881427be100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881427be180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881427be200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881427be280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881427be300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================