================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x24f/0x260 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff888027ade008 by task kworker/u19:0/64 CPU: 1 PID: 64 Comm: kworker/u19:0 Not tainted 6.1.0-rc8-syzkaller-00148-g0d1409e4ff08 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: hci4 hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 hci_cmd_timeout+0x24f/0x260 net/bluetooth/hci_core.c:1495 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 3757: 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:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node_track_caller+0x5b/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xdd/0x300 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc net/bluetooth/hci_sync.c:55 [inline] hci_cmd_sync_add net/bluetooth/hci_sync.c:96 [inline] __hci_cmd_sync_sk+0x56c/0xe30 net/bluetooth/hci_sync.c:158 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:247 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:272 [inline] hci_read_local_features_sync+0xc6/0x1e0 net/bluetooth/hci_sync.c:3228 hci_init_stage_sync net/bluetooth/hci_sync.c:3139 [inline] hci_init1_sync net/bluetooth/hci_sync.c:3322 [inline] hci_init_sync net/bluetooth/hci_sync.c:4400 [inline] hci_dev_init_sync net/bluetooth/hci_sync.c:4591 [inline] hci_dev_open_sync+0x1796/0x21b0 net/bluetooth/hci_sync.c:4671 hci_dev_do_open+0x2d/0x70 net/bluetooth/hci_core.c:483 hci_power_on+0xde/0x620 net/bluetooth/hci_core.c:984 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 3757: 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:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3585 [inline] __kmem_cache_free+0xcd/0x3b0 mm/slab.c:3592 skb_free_head+0xac/0x110 net/core/skbuff.c:760 skb_release_data+0x5f1/0x870 net/core/skbuff.c:789 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb net/core/skbuff.c:868 [inline] kfree_skb_reason+0x18a/0x4b0 net/core/skbuff.c:891 kfree_skb include/linux/skbuff.h:1216 [inline] hci_dev_open_sync+0xbf0/0x21b0 net/bluetooth/hci_sync.c:4706 hci_dev_do_open+0x2d/0x70 net/bluetooth/hci_core.c:483 hci_power_on+0xde/0x620 net/bluetooth/hci_core.c:984 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff888027ade000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff888027ade000, ffff888027ade200) The buggy address belongs to the physical page: page:ffffea00009eb780 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888027ade800 pfn:0x27ade flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000726208 ffffea0000022c08 ffff888012040600 raw: ffff888027ade800 ffff888027ade000 0000000100000002 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 0x242220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 3781, tgid 3781 (kworker/u16:4), ts 486037132671, free_ts 431686274633 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages_slowpath.constprop.0+0x36b/0x23d0 mm/page_alloc.c:5092 __alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5571 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x94/0x390 mm/slab.c:2570 cache_alloc_refill+0x27f/0x380 mm/slab.c:2943 ____cache_alloc mm/slab.c:3019 [inline] ____cache_alloc mm/slab.c:3002 [inline] __do_cache_alloc mm/slab.c:3202 [inline] slab_alloc_node mm/slab.c:3250 [inline] __kmem_cache_alloc_node+0x44a/0x510 mm/slab.c:3549 kmalloc_trace+0x26/0x60 mm/slab_common.c:1045 kmalloc include/linux/slab.h:553 [inline] tipc_sub_subscribe+0x159/0x840 net/tipc/subscr.c:146 tipc_conn_rcv_sub+0x2ea/0x650 net/tipc/topsrv.c:377 tipc_conn_rcv_from_sock+0x28e/0x300 net/tipc/topsrv.c:407 tipc_conn_recv_work+0xef/0x190 net/tipc/topsrv.c:423 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 slab_destroy mm/slab.c:1615 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1635 cache_flusharray mm/slab.c:3360 [inline] ___cache_free+0x2ac/0x3d0 mm/slab.c:3423 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slab.c:3257 [inline] __kmem_cache_alloc_node+0x266/0x510 mm/slab.c:3549 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0x4a/0xd0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] kzalloc include/linux/slab.h:689 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x2c/0x50 security/tomoyo/realpath.c:80 tomoyo_path_perm+0x370/0x410 security/tomoyo/file.c:831 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:199 security_path_symlink+0xe3/0x160 security/security.c:1184 do_symlinkat+0x10a/0x2e0 fs/namei.c:4425 __do_sys_symlinkat fs/namei.c:4447 [inline] __se_sys_symlinkat fs/namei.c:4444 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4444 Memory state around the buggy address: ffff888027addf00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff888027addf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027ade000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027ade080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027ade100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================