================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1485 Read of size 8 at addr ffff88801829e5d8 by task kworker/0:1/12528 CPU: 0 PID: 12528 Comm: kworker/0:1 Not tainted 6.0.0-rc6-syzkaller-00286-ga63f2e7cb110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: events 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+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1485 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 Allocated by task 3651: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] slab_alloc mm/slub.c:3256 [inline] __kmem_cache_alloc_lru mm/slub.c:3263 [inline] kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273 skb_clone+0x1e0/0x360 net/core/skbuff.c:1547 hci_cmd_work+0xba/0x3c0 net/bluetooth/hci_core.c:4048 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 Freed by task 3654: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kmem_cache_free+0x95/0x1d0 mm/slub.c:3556 kfree_skb include/linux/skbuff.h:1206 [inline] hci_dev_open_sync+0x622/0x8d0 net/bluetooth/hci_sync.c:4377 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:975 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 The buggy address belongs to the object at ffff88801829e500 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 216 bytes inside of 240-byte region [ffff88801829e500, ffff88801829e5f0) The buggy address belongs to the physical page: page:ffffea000060a780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1829e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00009eaa40 dead000000000002 ffff8880170b8500 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 5091, tgid 5091 (kworker/0:44), ts 668120309410, free_ts 667040894366 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] kmem_cache_alloc_node+0x28a/0x350 mm/slub.c:3298 __alloc_skb+0xd5/0x620 net/core/skbuff.c:422 alloc_skb include/linux/skbuff.h:1257 [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+0x267/0xad0 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 __vunmap+0x867/0x9d0 mm/vmalloc.c:2696 free_work+0x66/0x90 mm/vmalloc.c:97 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 Memory state around the buggy address: ffff88801829e480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88801829e500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801829e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88801829e600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88801829e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================