================================================================== BUG: KASAN: use-after-free in skb_end_pointer include/linux/skbuff.h:1594 [inline] BUG: KASAN: use-after-free in skb_zcopy include/linux/skbuff.h:1655 [inline] BUG: KASAN: use-after-free in skb_release_data+0x142/0x7a0 net/core/skbuff.c:776 Read of size 8 at addr ffff88805cd9cad0 by task syz-executor.3/3573 CPU: 0 PID: 3573 Comm: syz-executor.3 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 skb_end_pointer include/linux/skbuff.h:1594 [inline] skb_zcopy include/linux/skbuff.h:1655 [inline] skb_release_data+0x142/0x7a0 net/core/skbuff.c:776 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] __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: 0033:0x7f0169e7dc0b 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:00007ffd465443b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0169e7dc0b RDX: 00007ffd46544428 RSI: 00000000400448dd RDI: 0000000000000003 RBP: 0000555556d5c430 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000004 R14: 00007f0169fac9d8 R15: 000000000000000c Allocated by task 3564: 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 3564: 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 ffff88805cd9ca00 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 208 bytes inside of 240-byte region [ffff88805cd9ca00, ffff88805cd9caf0) The buggy address belongs to the physical page: page:ffffea0001736700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5cd9c flags: 0xfff80000000200(slab|node=0|zone=1|lastcpupid=0xfff) raw: 00fff80000000200 0000000000000000 dead000000000122 ffff888014652000 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3564, tgid 3564 (kworker/u5:3), ts 53655287622, free_ts 11037737470 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] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc net/bluetooth/hci_sync.c:59 [inline] hci_cmd_sync_add net/bluetooth/hci_sync.c:100 [inline] __hci_cmd_sync_sk+0x154/0x1100 net/bluetooth/hci_sync.c:162 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:251 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:277 [inline] hci_read_current_iac_lap_sync+0x29/0x120 net/bluetooth/hci_sync.c:3556 hci_init_stage_sync net/bluetooth/hci_sync.c:3315 [inline] hci_init2_sync net/bluetooth/hci_sync.c:3783 [inline] hci_init_sync net/bluetooth/hci_sync.c:4588 [inline] hci_dev_init_sync net/bluetooth/hci_sync.c:4772 [inline] hci_dev_open_sync+0x2f0d/0x35f0 net/bluetooth/hci_sync.c:4852 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x1c4/0x6f0 net/bluetooth/hci_core.c:984 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 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 free_contig_range+0x9a/0x150 mm/page_alloc.c:9507 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354 do_one_initcall+0x265/0x8f0 init/main.c:1299 do_initcall_level+0x157/0x207 init/main.c:1372 do_initcalls+0x49/0x86 init/main.c:1388 kernel_init_freeable+0x45c/0x60f init/main.c:1627 kernel_init+0x19/0x290 init/main.c:1515 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88805cd9c980: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88805cd9ca00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805cd9ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88805cd9cb00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88805cd9cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================