================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1486 Read of size 2 at addr ffff88801dbe3008 by task kworker/1:5/3689 CPU: 1 PID: 3689 Comm: kworker/1:5 Not tainted 6.0.0-rc7-syzkaller-00239-gb357fd1c2afc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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+0x1c3/0x1f0 net/bluetooth/hci_core.c:1486 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 5046: 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_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc_node_track_caller+0x265/0x400 mm/slub.c:4969 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1257 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc+0x39/0x340 net/bluetooth/hci_sync.c:54 hci_cmd_sync_add+0xaa/0x240 net/bluetooth/hci_sync.c:95 __hci_cmd_sync_sk+0xdf/0x680 net/bluetooth/hci_sync.c:157 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:246 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:271 [inline] hci_read_local_features_sync net/bluetooth/hci_sync.c:2906 [inline] hci_init_stage_sync net/bluetooth/hci_sync.c:2817 [inline] hci_init1_sync+0x1d6/0x6d0 net/bluetooth/hci_sync.c:3000 hci_init_sync net/bluetooth/hci_sync.c:4075 [inline] hci_dev_init_sync+0x24a/0x6b0 net/bluetooth/hci_sync.c:4263 hci_dev_open_sync+0x34e/0x8d0 net/bluetooth/hci_sync.c:4343 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 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88801dbe3000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88801dbe3000, ffff88801dbe3200) The buggy address belongs to the physical page: page:ffffea000076f800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dbe0 head:ffffea000076f800 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012041c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3599, tgid 3598 (syz-fuzzer), ts 88100653312, free_ts 81485561448 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:5549 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] __kmalloc_node_track_caller+0x2c3/0x400 mm/slub.c:4964 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:434 __napi_alloc_skb+0x16b/0x680 net/core/skbuff.c:575 napi_alloc_skb include/linux/skbuff.h:3207 [inline] page_to_skb+0x299/0xb80 drivers/net/virtio_net.c:496 receive_mergeable+0x34e/0x26e0 drivers/net/virtio_net.c:1119 receive_buf+0x15c/0x1c80 drivers/net/virtio_net.c:1258 virtnet_receive drivers/net/virtio_net.c:1553 [inline] virtnet_poll+0x64e/0x12a0 drivers/net/virtio_net.c:1671 __napi_poll+0xbe/0x4b0 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x76c/0x10b0 net/core/dev.c:6689 __do_softirq+0x382/0x793 kernel/softirq.c:571 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 free_slab mm/slub.c:2073 [inline] discard_slab mm/slub.c:2079 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2553 put_cpu_partial+0x116/0x180 mm/slub.c:2629 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 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 ptlock_alloc+0x1c/0x60 mm/memory.c:5780 ptlock_init include/linux/mm.h:2261 [inline] pgtable_pte_page_ctor include/linux/mm.h:2288 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0xd1/0x360 arch/x86/mm/pgtable.c:33 __pte_alloc+0x75/0x210 mm/memory.c:468 do_anonymous_page+0xe03/0x1150 mm/memory.c:4052 handle_pte_fault mm/memory.c:4915 [inline] __handle_mm_fault mm/memory.c:5059 [inline] handle_mm_fault+0x186b/0x35c0 mm/memory.c:5157 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1488 [inline] exc_page_fault+0x7a/0x120 arch/x86/mm/fault.c:1544 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff88801dbe2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801dbe2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801dbe3000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801dbe3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801dbe3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================