================================================================== BUG: KASAN: slab-use-after-free in hci_conn_del+0x599/0x950 net/bluetooth/hci_conn.c:1142 Read of size 1 at addr ffff888064438039 by task kworker/u5:0/48 CPU: 0 PID: 48 Comm: kworker/u5:0 Not tainted 6.3.0-rc7-next-20230420-syzkaller-13291-g44bf136283e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 hci_conn_del+0x599/0x950 net/bluetooth/hci_conn.c:1142 hci_sco_setup+0x45c/0x560 net/bluetooth/hci_conn.c:658 hci_conn_complete_evt+0xe68/0x1010 net/bluetooth/hci_event.c:3229 hci_event_func net/bluetooth/hci_event.c:7477 [inline] hci_event_packet+0x956/0xfd0 net/bluetooth/hci_event.c:7529 hci_rx_work+0xaeb/0x1340 net/bluetooth/hci_core.c:4059 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 5269: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] hci_conn_add+0xb8/0x16b0 net/bluetooth/hci_conn.c:986 hci_connect_sco+0x3c7/0x1050 net/bluetooth/hci_conn.c:1663 sco_connect net/bluetooth/sco.c:264 [inline] sco_sock_connect+0x2d7/0xae0 net/bluetooth/sco.c:610 __sys_connect_file+0x153/0x1a0 net/socket.c:2003 __sys_connect+0x165/0x1a0 net/socket.c:2020 __do_sys_connect net/socket.c:2030 [inline] __se_sys_connect net/socket.c:2027 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 48: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799 device_release+0xa3/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:683 [inline] kobject_release lib/kobject.c:714 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:731 put_device+0x1f/0x30 drivers/base/core.c:3733 hci_conn_del+0x1e5/0x950 net/bluetooth/hci_conn.c:1162 hci_conn_unlink+0x2ce/0x460 net/bluetooth/hci_conn.c:1109 hci_conn_del+0x10f/0x950 net/bluetooth/hci_conn.c:1137 hci_sco_setup+0x45c/0x560 net/bluetooth/hci_conn.c:658 hci_conn_complete_evt+0xe68/0x1010 net/bluetooth/hci_event.c:3229 hci_event_func net/bluetooth/hci_event.c:7477 [inline] hci_event_packet+0x956/0xfd0 net/bluetooth/hci_event.c:7529 hci_rx_work+0xaeb/0x1340 net/bluetooth/hci_core.c:4059 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 insert_work+0x48/0x360 kernel/workqueue.c:1365 __queue_work+0x5c6/0xfb0 kernel/workqueue.c:1526 __queue_delayed_work+0x1c8/0x270 kernel/workqueue.c:1674 queue_delayed_work_on+0x109/0x120 kernel/workqueue.c:1710 queue_delayed_work include/linux/workqueue.h:520 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1444 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1414 [inline] sco_chan_del+0x1f8/0x4f0 net/bluetooth/sco.c:169 sco_conn_del+0x140/0x2b0 net/bluetooth/sco.c:199 sco_connect_cfm+0x1f4/0x900 net/bluetooth/sco.c:1382 hci_connect_cfm include/net/bluetooth/hci_core.h:1819 [inline] hci_sco_setup+0x3c1/0x560 net/bluetooth/hci_conn.c:657 hci_conn_complete_evt+0xe68/0x1010 net/bluetooth/hci_event.c:3229 hci_event_func net/bluetooth/hci_event.c:7477 [inline] hci_event_packet+0x956/0xfd0 net/bluetooth/hci_event.c:7529 hci_rx_work+0xaeb/0x1340 net/bluetooth/hci_core.c:4059 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff888064438000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 57 bytes inside of freed 4096-byte region [ffff888064438000, ffff888064439000) The buggy address belongs to the physical page: page:ffffea0001910e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64438 head:ffffea0001910e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012442140 dead000000000122 0000000000000000 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5269, tgid 5268 (syz-executor.0), ts 84901292457, free_ts 15024243361 prep_new_page mm/page_alloc.c:1729 [inline] get_page_from_freelist+0xf7c/0x2aa0 mm/page_alloc.c:3493 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2277 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] hci_conn_add+0xb8/0x16b0 net/bluetooth/hci_conn.c:986 hci_connect_sco+0x3c7/0x1050 net/bluetooth/hci_conn.c:1663 sco_connect net/bluetooth/sco.c:264 [inline] sco_sock_connect+0x2d7/0xae0 net/bluetooth/sco.c:610 __sys_connect_file+0x153/0x1a0 net/socket.c:2003 __sys_connect+0x165/0x1a0 net/socket.c:2020 __do_sys_connect net/socket.c:2030 [inline] __se_sys_connect net/socket.c:2027 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x4d8/0xb80 mm/page_alloc.c:2555 free_unref_page+0x33/0x370 mm/page_alloc.c:2650 free_contig_range+0xb5/0x180 mm/page_alloc.c:6985 destroy_args+0x6c4/0x920 mm/debug_vm_pgtable.c:1023 debug_vm_pgtable+0x214a/0x4050 mm/debug_vm_pgtable.c:1403 do_one_initcall+0x102/0x540 init/main.c:1246 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+0x5a4/0x890 init/main.c:1571 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888064437f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888064437f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888064438000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064438080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064438100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================