================================================================== BUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1455 [inline] BUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1448 [inline] BUG: KASAN: slab-use-after-free in sco_chan_del+0x49f/0x4f0 net/bluetooth/sco.c:169 Read of size 1 at addr ffff88802aa20039 by task syz-executor.3/5230 CPU: 1 PID: 5230 Comm: syz-executor.3 Not tainted 6.4.0-rc7-next-20230623-syzkaller-g8d2be868b42c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 hci_conn_drop include/net/bluetooth/hci_core.h:1455 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1448 [inline] sco_chan_del+0x49f/0x4f0 net/bluetooth/sco.c:169 __sco_sock_close+0x178/0x740 net/bluetooth/sco.c:454 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x81/0x360 net/bluetooth/sco.c:1259 __sock_release+0xcd/0x290 net/socket.c:654 sock_close+0x1c/0x20 net/socket.c:1386 __fput+0x40c/0xad0 fs/file_table.c:378 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x25f0 kernel/signal.c:2653 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x464759 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd498f0a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 000000000055bf00 RCX: 0000000000464759 RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00000000004ae608 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffcc5908b7f R14: 00007fd498f0a300 R15: 0000000000022000 Allocated by task 5230: 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:579 [inline] kzalloc include/linux/slab.h:700 [inline] hci_conn_add+0xb8/0x16b0 net/bluetooth/hci_conn.c:1000 hci_connect_sco+0x3c7/0x1050 net/bluetooth/hci_conn.c:1682 sco_connect net/bluetooth/sco.c:264 [inline] sco_sock_connect+0x2d7/0xae0 net/bluetooth/sco.c:602 __sys_connect_file+0x15f/0x1a0 net/socket.c:1992 __sys_connect+0x165/0x1a0 net/socket.c:2009 __do_sys_connect net/socket.c:2019 [inline] __se_sys_connect net/socket.c:2016 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2016 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 5207: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/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:164 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0xb8/0x2d0 mm/slub.c:3814 device_release+0xa3/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:713 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:730 put_device+0x1f/0x30 drivers/base/core.c:3733 hci_conn_unlink+0x6f6/0x850 net/bluetooth/hci_conn.c:1120 hci_conn_del+0x4d/0x590 net/bluetooth/hci_conn.c:1146 hci_conn_complete_evt+0x867/0x1010 net/bluetooth/hci_event.c:3236 hci_event_func net/bluetooth/hci_event.c:7536 [inline] hci_event_packet+0x956/0xfd0 net/bluetooth/hci_event.c:7588 hci_rx_work+0xaeb/0x1340 net/bluetooth/hci_core.c:4088 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2594 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2745 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88802aa20000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 57 bytes inside of freed 4096-byte region [ffff88802aa20000, ffff88802aa21000) The buggy address belongs to the physical page: page:ffffea0000aa8800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2aa20 head:ffffea0000aa8800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842140 0000000000000000 dead000000000001 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4773, tgid 4773 (rm), ts 36699921776, free_ts 36620575010 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfd9/0x2c40 mm/page_alloc.c:3257 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4513 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x25f/0x390 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x143/0x350 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x4e/0x190 mm/slab_common.c:998 kmalloc include/linux/slab.h:583 [inline] tomoyo_realpath_from_path+0xc3/0x600 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x29a/0x3a0 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:332 [inline] tomoyo_file_open+0xaa/0xd0 security/tomoyo/tomoyo.c:327 security_file_open+0x49/0xb0 security/security.c:2797 do_dentry_open+0x57a/0x17b0 fs/open.c:901 do_open fs/namei.c:3636 [inline] path_openat+0x1b65/0x2710 fs/namei.c:3793 do_filp_open+0x1ba/0x410 fs/namei.c:3820 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2384 free_unref_page+0x33/0x370 mm/page_alloc.c:2479 __unfreeze_partials+0x1fe/0x220 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x16c/0x380 mm/slub.c:3494 vm_area_dup+0x23/0x300 kernel/fork.c:500 __split_vma+0x199/0x830 mm/mmap.c:2261 split_vma+0xc6/0x110 mm/mmap.c:2331 mprotect_fixup+0x90e/0xbd0 mm/mprotect.c:649 do_mprotect_pkey+0x883/0xd40 mm/mprotect.c:817 __do_sys_mprotect mm/mprotect.c:838 [inline] __se_sys_mprotect mm/mprotect.c:835 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:835 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 Memory state around the buggy address: ffff88802aa1ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802aa1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802aa20000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802aa20080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802aa20100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================