Bluetooth: hci7: Received unexpected HCI Event 00000000 ================================================================== BUG: KASAN: use-after-free in __skb_unlink include/linux/skbuff.h:2090 [inline] BUG: KASAN: use-after-free in __skb_dequeue include/linux/skbuff.h:2109 [inline] BUG: KASAN: use-after-free in skb_dequeue+0x90/0x140 net/core/skbuff.c:3159 Read of size 8 at addr ffff888022b3e140 by task kworker/u5:0/2029 CPU: 0 PID: 2029 Comm: kworker/u5:0 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci7 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 __skb_unlink include/linux/skbuff.h:2090 [inline] __skb_dequeue include/linux/skbuff.h:2109 [inline] skb_dequeue+0x90/0x140 net/core/skbuff.c:3159 hci_rx_work+0x2e0/0x410 net/bluetooth/hci_core.c:5084 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 7978: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x96/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] kmem_cache_alloc_node+0x200/0x370 mm/slub.c:2995 __alloc_skb+0xd8/0x580 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1112 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline] h4_recv_buf+0x274/0xd50 drivers/bluetooth/hci_h4.c:181 h4_recv+0xf4/0x1b0 drivers/bluetooth/hci_h4.c:115 hci_uart_tty_receive+0x1d2/0x4a0 drivers/bluetooth/hci_ldisc.c:613 tiocsti drivers/tty/tty_io.c:2311 [inline] tty_ioctl+0xde5/0x1720 drivers/tty/tty_io.c:2719 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 2029: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1628 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kmem_cache_free+0x85/0x170 mm/slub.c:3229 hci_event_packet+0x1238/0x1bd0 net/bluetooth/hci_event.c:6400 hci_rx_work+0x229/0x410 net/bluetooth/hci_core.c:5120 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888022b3e140 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff888022b3e140, ffff888022b3e228) The buggy address belongs to the page: page:ffffea00008acf80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b3e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001549f40 0000000600000002 ffff8881400ef640 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 7319, ts 903360746262, free_ts 884615602470 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2803 __slab_alloc mm/slub.c:2843 [inline] slab_alloc_node mm/slub.c:2925 [inline] kmem_cache_alloc_node+0x2ca/0x370 mm/slub.c:2995 __alloc_skb+0xd8/0x580 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1112 [inline] alloc_skb_with_frags+0xab/0x660 net/core/skbuff.c:6019 sock_alloc_send_pskb+0x930/0xa70 net/core/sock.c:2461 __ip6_append_data+0x2c26/0x4210 net/ipv6/ip6_output.c:1653 ip6_append_data+0x1d5/0x300 net/ipv6/ip6_output.c:1827 icmp6_send+0x17a1/0x2700 net/ipv6/icmp.c:618 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x37/0x450 net/ipv6/route.c:2779 dst_link_failure include/net/dst.h:427 [inline] ip6_tnl_xmit+0x1632/0x3010 net/ipv6/ip6_tunnel.c:1265 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1381 [inline] ip6_tnl_start_xmit+0xf7f/0x1640 net/ipv6/ip6_tunnel.c:1430 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one net/core/dev.c:3659 [inline] dev_hard_start_xmit+0x20b/0x450 net/core/dev.c:3675 __dev_queue_xmit+0x1bd9/0x34b0 net/core/dev.c:4285 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x7e/0x550 mm/page_alloc.c:3411 kasan_depopulate_vmalloc_pte+0x66/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2532 [inline] apply_to_pmd_range mm/memory.c:2576 [inline] apply_to_pud_range mm/memory.c:2612 [inline] apply_to_p4d_range mm/memory.c:2648 [inline] __apply_to_page_range+0x9e4/0xc40 mm/memory.c:2682 kasan_release_vmalloc+0x96/0xb0 mm/kasan/shadow.c:485 __purge_vmap_area_lazy+0xcba/0x18d0 mm/vmalloc.c:1670 try_purge_vmap_area_lazy mm/vmalloc.c:1689 [inline] free_vmap_area_noflush+0x9a1/0xa10 mm/vmalloc.c:1731 free_unmap_vmap_area mm/vmalloc.c:1744 [inline] remove_vm_area+0x1ff/0x220 mm/vmalloc.c:2483 vm_remove_mappings mm/vmalloc.c:2512 [inline] __vunmap+0x32e/0xa70 mm/vmalloc.c:2577 vb2_vmalloc_put+0x67/0xb0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:69 __vb2_buf_mem_free+0x111/0x2a0 drivers/media/common/videobuf2/videobuf2-core.c:265 __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:486 [inline] __vb2_queue_free+0x4cd/0xdb0 drivers/media/common/videobuf2/videobuf2-core.c:531 vb2_core_reqbufs+0x606/0x1000 drivers/media/common/videobuf2/videobuf2-core.c:770 __vb2_cleanup_fileio drivers/media/common/videobuf2/videobuf2-core.c:2656 [inline] vb2_core_queue_release+0xf8/0x240 drivers/media/common/videobuf2/videobuf2-core.c:2373 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:938 [inline] _vb2_fop_release drivers/media/common/videobuf2/videobuf2-v4l2.c:1125 [inline] vb2_fop_release+0x15e/0x1e0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1139 v4l2_release+0x1e6/0x3a0 drivers/media/v4l2-core/v4l2-dev.c:456 Memory state around the buggy address: ffff888022b3e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022b3e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc >ffff888022b3e100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff888022b3e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022b3e200: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ==================================================================