================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1473 Read of size 8 at addr ffff88802072bf58 by task kworker/0:3/3736 CPU: 0 PID: 3736 Comm: kworker/0:3 Not tainted 5.18.0-syzkaller-11080-g664a393a2663 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1473 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Allocated by task 3711: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc mm/slab.c:3302 [inline] __kmem_cache_alloc_lru mm/slab.c:3479 [inline] kmem_cache_alloc+0x265/0x560 mm/slab.c:3499 skb_clone+0x170/0x3c0 net/core/skbuff.c:1515 hci_cmd_work+0x191/0x3c0 net/bluetooth/hci_core.c:3853 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Freed by task 63: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3425 [inline] kmem_cache_free.part.0+0xa9/0x240 mm/slab.c:3735 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:700 kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279 kfree_skb include/linux/skbuff.h:1375 [inline] hci_dev_open_sync+0xb8c/0x2160 net/bluetooth/hci_sync.c:4052 hci_dev_do_open+0x32/0x70 net/bluetooth/hci_core.c:482 hci_power_on+0x133/0x630 net/bluetooth/hci_core.c:963 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 The buggy address belongs to the object at ffff88802072be80 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 216 bytes inside of 240-byte region [ffff88802072be80, ffff88802072bf70) The buggy address belongs to the physical page: page:ffffea000081cac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2072b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00004fc608 ffffea00005557c8 ffff8880402b3700 raw: 0000000000000000 ffff88802072b0c0 000000010000000c 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 1, tgid 1 (swapper/0), ts 19607104071, free_ts 19198657052 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 __alloc_pages_node include/linux/gfp.h:587 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x350 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3024 [inline] ____cache_alloc mm/slab.c:3007 [inline] slab_alloc_node mm/slab.c:3227 [inline] kmem_cache_alloc_node+0x503/0x590 mm/slab.c:3593 __alloc_skb+0x215/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1426 [inline] alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:412 [inline] kobject_uevent_env+0x1128/0x1660 lib/kobject_uevent.c:593 rx_queue_add_kobject net/core/net-sysfs.c:1073 [inline] net_rx_queue_update_kobjects+0xe9/0x510 net/core/net-sysfs.c:1113 register_queue_kobjects net/core/net-sysfs.c:1773 [inline] netdev_register_kobject+0x275/0x400 net/core/net-sysfs.c:2018 register_netdevice+0xd9d/0x15b0 net/core/dev.c:10045 register_netdev+0x2d/0x50 net/core/dev.c:10171 rose_proto_init+0x317/0x66a net/rose/af_rose.c:1532 do_one_initcall+0x103/0x650 init/main.c:1295 do_initcall_level init/main.c:1368 [inline] do_initcalls init/main.c:1384 [inline] do_basic_setup init/main.c:1403 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1610 kernel_init+0x1a/0x1d0 init/main.c:1499 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 __vunmap+0x85d/0xd30 mm/vmalloc.c:2665 free_work+0x58/0x70 mm/vmalloc.c:97 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff88802072be00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88802072be80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802072bf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88802072bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802072c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================