================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1494 Read of size 8 at addr ffff888072724498 by task kworker/u5:1/3640 CPU: 0 PID: 3640 Comm: kworker/u5:1 Not tainted 6.1.0-rc1-syzkaller-00134-ge35184f32151 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Workqueue: hci6 hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x220 mm/kasan/report.c:395 kasan_report+0x139/0x170 mm/kasan/report.c:495 hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1494 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 3640: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1cc/0x300 mm/slub.c:3422 skb_clone+0x1e0/0x360 net/core/skbuff.c:1650 hci_cmd_work+0xba/0x490 net/bluetooth/hci_core.c:4080 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 3655: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x94/0x1d0 mm/slub.c:3683 kfree_skb include/linux/skbuff.h:1216 [inline] hci_dev_open_sync+0x622/0x8e0 net/bluetooth/hci_sync.c:4699 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:984 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff8880727243c0 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 216 bytes inside of 240-byte region [ffff8880727243c0, ffff8880727244b0) The buggy address belongs to the physical page: page:ffffea0001c9c900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x72724 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00008a6380 dead000000000002 ffff88801749d000 raw: 0000000000000000 00000000000c000c 00000001ffffffff 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 27, tgid 27 (kworker/1:1), ts 479052803326, free_ts 478780101468 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4287 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] kmem_cache_alloc_node+0x283/0x340 mm/slub.c:3443 __alloc_skb+0xd5/0x620 net/core/skbuff.c:497 alloc_skb include/linux/skbuff.h:1267 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:742 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:799 [inline] nsim_dev_trap_report_work+0x268/0xaa0 drivers/net/netdevsim/dev.c:844 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 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:1458 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3528 release_pages+0x233a/0x25d0 mm/swap.c:1055 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:256 [inline] tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:263 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:363 exit_mmap+0x2b1/0x670 mm/mmap.c:3098 __mmput+0x114/0x3b0 kernel/fork.c:1185 exit_mm+0x217/0x2f0 kernel/exit.c:516 do_exit+0x5e7/0x2070 kernel/exit.c:807 do_group_exit+0x1fd/0x2b0 kernel/exit.c:950 get_signal+0x1743/0x1810 kernel/signal.c:2858 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888072724380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888072724400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888072724480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ^ ffff888072724500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888072724580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ==================================================================