================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1203 [inline] BUG: KASAN: use-after-free in kfree_skb_reason+0x3d/0x390 net/core/skbuff.c:887 Read of size 4 at addr ffff88805c13ad64 by task syz-executor.1/3571 CPU: 1 PID: 3571 Comm: syz-executor.1 Not tainted 6.1.88-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] skb_unref include/linux/skbuff.h:1203 [inline] kfree_skb_reason+0x3d/0x390 net/core/skbuff.c:887 kfree_skb include/linux/skbuff.h:1220 [inline] __hci_req_sync+0x626/0x940 net/bluetooth/hci_request.c:184 hci_req_sync+0xa5/0xc0 net/bluetooth/hci_request.c:206 hci_dev_cmd+0x2fc/0xa30 net/bluetooth/hci_core.c:790 sock_do_ioctl+0x152/0x450 net/socket.c:1204 sock_ioctl+0x47f/0x770 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbdd747dc0b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007ffdb5f2f400 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbdd747dc0b RDX: 00007ffdb5f2f478 RSI: 00000000400448dd RDI: 0000000000000003 RBP: 0000555556f62430 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000002 R14: 00007fbdd75ac9d8 R15: 000000000000000c Allocated by task 3572: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 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+0x10c/0x2d0 mm/slub.c:3422 skb_clone+0x1e5/0x360 net/core/skbuff.c:1660 hci_send_cmd_sync net/bluetooth/hci_core.c:4179 [inline] hci_cmd_work+0x296/0x660 net/bluetooth/hci_core.c:4199 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 3581: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____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 mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x292/0x510 mm/slub.c:3683 kfree_skb include/linux/skbuff.h:1220 [inline] hci_req_sync_complete+0xee/0x280 net/bluetooth/hci_request.c:109 hci_event_packet+0xc49/0x1510 net/bluetooth/hci_event.c:7601 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4130 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88805c13ac80 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 228 bytes inside of 240-byte region [ffff88805c13ac80, ffff88805c13ad70) The buggy address belongs to the physical page: page:ffffea0001704e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c13a flags: 0xfff80000000200(slab|node=0|zone=1|lastcpupid=0xfff) raw: 00fff80000000200 0000000000000000 dead000000000122 ffff888014a54500 raw: 0000000000000000 00000000800c000c 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 3568, tgid 3568 (syz-executor.2), ts 64534154943, free_ts 64531950477 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] kmem_cache_alloc_node+0x1cf/0x310 mm/slub.c:3443 __alloc_skb+0xde/0x670 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1271 [inline] alloc_uevent_skb+0x74/0x220 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x178/0x560 lib/kobject_uevent.c:412 kobject_uevent_env+0x576/0x8c0 lib/kobject_uevent.c:593 netdev_queue_add_kobject net/core/net-sysfs.c:1677 [inline] netdev_queue_update_kobjects+0x22d/0x480 net/core/net-sysfs.c:1718 register_queue_kobjects net/core/net-sysfs.c:1779 [inline] netdev_register_kobject+0x263/0x310 net/core/net-sysfs.c:2019 register_netdevice+0x108a/0x1720 net/core/dev.c:10099 __ip_tunnel_create+0x2b0/0x370 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x21f/0x700 net/ipv4/ip_tunnel.c:1100 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 skb_free_frag include/linux/skbuff.h:3215 [inline] skb_free_head net/core/skbuff.c:760 [inline] skb_release_data+0x636/0x7a0 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x16f/0x390 net/core/skbuff.c:893 kfree_skb include/linux/skbuff.h:1220 [inline] napi_free_frags include/linux/netdevice.h:3845 [inline] napi_get_frags_check+0x5f/0x90 net/core/skbuff.c:217 netif_napi_add_weight+0x895/0xc10 net/core/dev.c:6431 netif_napi_add include/linux/netdevice.h:2578 [inline] gro_cells_init+0x1b2/0x270 net/core/gro_cells.c:84 ip_tunnel_init+0x20c/0x390 net/ipv4/ip_tunnel.c:1268 register_netdevice+0x5fc/0x1720 net/core/dev.c:10029 __ip_tunnel_create+0x2b0/0x370 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x21f/0x700 net/ipv4/ip_tunnel.c:1100 vti_init_net+0x2a/0xf0 net/ipv4/ip_vti.c:504 ops_init+0x356/0x600 net/core/net_namespace.c:135 setup_net+0x4b5/0xb90 net/core/net_namespace.c:332 copy_net_ns+0x395/0x5d0 net/core/net_namespace.c:478 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 Memory state around the buggy address: ffff88805c13ac00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88805c13ac80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805c13ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88805c13ad80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88805c13ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================