================================================================== BUG: KASAN: slab-use-after-free in hci_send_acl+0xeb7/0x1050 net/bluetooth/hci_core.c:3231 Read of size 8 at addr ffff88803792d718 by task kworker/1:3/5115 CPU: 1 PID: 5115 Comm: kworker/1:3 Not tainted 6.6.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: events l2cap_info_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 hci_send_acl+0xeb7/0x1050 net/bluetooth/hci_core.c:3231 l2cap_send_cmd+0x6dd/0x920 net/bluetooth/l2cap_core.c:977 l2cap_send_conn_req+0x1e5/0x260 net/bluetooth/l2cap_core.c:1286 l2cap_start_connection+0x11e/0x420 net/bluetooth/l2cap_core.c:1514 l2cap_conn_start+0x7ae/0xa40 net/bluetooth/l2cap_core.c:1661 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 13774: kasan_save_stack+0x33/0x50 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+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] hci_chan_create+0xa6/0x3d0 net/bluetooth/hci_conn.c:2723 l2cap_conn_add.part.0+0x1a/0xdf0 net/bluetooth/l2cap_core.c:7841 l2cap_conn_add include/net/bluetooth/hci_core.h:1521 [inline] l2cap_chan_connect+0x15de/0x2170 net/bluetooth/l2cap_core.c:8053 bt_6lowpan_connect net/bluetooth/6lowpan.c:894 [inline] lowpan_control_write+0x3d6/0x730 net/bluetooth/6lowpan.c:1129 full_proxy_write+0x124/0x190 fs/debugfs/file.c:236 vfs_write+0x2a4/0xe40 fs/read_write.c:582 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5086: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x138/0x190 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcc/0x2d0 mm/slab.c:3564 hci_chan_list_flush+0x81/0xf0 net/bluetooth/hci_conn.c:2763 hci_conn_cleanup net/bluetooth/hci_conn.c:152 [inline] hci_conn_del+0x201/0xd80 net/bluetooth/hci_conn.c:1156 hci_abort_conn_sync+0x573/0xe10 net/bluetooth/hci_sync.c:5428 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2910 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0x78/0x80 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 kernfs_unlink_open_file+0x3b6/0x4b0 fs/kernfs/file.c:633 kernfs_fop_release+0xec/0x1e0 fs/kernfs/file.c:805 __fput+0x3f7/0xa70 fs/file_table.c:384 __fput_sync+0x47/0x50 fs/file_table.c:465 __do_sys_close fs/open.c:1572 [inline] __se_sys_close fs/open.c:1557 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1557 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0x78/0x80 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 kernfs_unlink_open_file+0x3b6/0x4b0 fs/kernfs/file.c:633 kernfs_fop_release+0xec/0x1e0 fs/kernfs/file.c:805 __fput+0x3f7/0xa70 fs/file_table.c:384 __fput_sync+0x47/0x50 fs/file_table.c:465 __do_sys_close fs/open.c:1572 [inline] __se_sys_close fs/open.c:1557 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1557 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88803792d700 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88803792d700, ffff88803792d780) The buggy address belongs to the physical page: page:ffffea0000de4b40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3792d flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x10() raw: 00fff00000000800 ffff888012c40400 ffffea0000de6250 ffffea000075bed0 raw: 0000000000000000 ffff88803792d000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 5073, tgid 5073 (syz-executor.5), ts 247298585452, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x99/0x3a0 mm/slab.c:2550 cache_alloc_refill+0x294/0x3a0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3182 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x3c5/0x470 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:1025 [inline] __kmalloc_node_track_caller+0x50/0x100 mm/slab_common.c:1046 kmemdup+0x29/0x60 mm/util.c:131 kmemdup include/linux/fortify-string.h:765 [inline] mpls_dev_sysctl_register+0xce/0x330 net/mpls/af_mpls.c:1407 mpls_add_dev net/mpls/af_mpls.c:1478 [inline] mpls_dev_notify+0x48f/0xa00 net/mpls/af_mpls.c:1618 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1995 call_netdevice_notifiers_extack net/core/dev.c:2033 [inline] call_netdevice_notifiers net/core/dev.c:2047 [inline] register_netdevice+0xf84/0x1490 net/core/dev.c:10198 veth_newlink+0x36a/0xa10 drivers/net/veth.c:1908 rtnl_newlink_create net/core/rtnetlink.c:3485 [inline] __rtnl_newlink+0x1177/0x1940 net/core/rtnetlink.c:3705 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3718 page_owner free stack trace missing Memory state around the buggy address: ffff88803792d600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803792d680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803792d700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803792d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803792d800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================