================================================================== BUG: KASAN: slab-use-after-free in skb_dst_drop include/net/dst.h:274 [inline] BUG: KASAN: slab-use-after-free in skb_release_head_state+0x39/0x250 net/core/skbuff.c:1157 Read of size 8 at addr ffff88807ac2ea58 by task syz-executor.2/18858 CPU: 1 PID: 18858 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00440-ga99997323654 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 skb_dst_drop include/net/dst.h:274 [inline] skb_release_head_state+0x39/0x250 net/core/skbuff.c:1157 skb_release_all net/core/skbuff.c:1171 [inline] __kfree_skb net/core/skbuff.c:1187 [inline] kfree_skb_reason+0x16d/0x3b0 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1263 [inline] __hci_req_sync+0x62f/0x950 net/bluetooth/hci_request.c:184 hci_req_sync+0xa9/0xd0 net/bluetooth/hci_request.c:206 hci_dev_cmd+0x4c5/0xa50 net/bluetooth/hci_core.c:787 sock_do_ioctl+0x158/0x460 net/socket.c:1222 sock_ioctl+0x629/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4144c7cccb 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:00007ffe4e740bc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4144c7cccb RDX: 00007ffe4e740c38 RSI: 00000000400448dd RDI: 0000000000000003 RBP: 0000555589932430 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000000c Allocated by task 5113: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4007 skb_clone+0x20c/0x390 net/core/skbuff.c:2052 hci_send_cmd_sync net/bluetooth/hci_core.c:4123 [inline] hci_cmd_work+0x29e/0x670 net/bluetooth/hci_core.c:4143 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 5113: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2195 [inline] slab_free mm/slub.c:4436 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4511 kfree_skb include/linux/skbuff.h:1263 [inline] hci_req_sync_complete+0xe7/0x290 net/bluetooth/hci_request.c:109 hci_event_packet+0xc71/0x1540 net/bluetooth/hci_event.c:7479 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4074 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88807ac2ea00 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 88 bytes inside of freed 240-byte region [ffff88807ac2ea00, ffff88807ac2eaf0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ac2e anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000000 ffff888018e9f780 ffffea000188b4c0 dead000000000005 raw: 0000000000000000 00000000000c000c 00000001ffffefff 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 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 17023, tgid 17023 (syz-executor.0), ts 1265221932470, free_ts 1264759186799 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2e2d/0x2ee0 mm/page_alloc.c:3402 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4660 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2264 allocate_slab+0x5a/0x2e0 mm/slub.c:2427 new_slab mm/slub.c:2480 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666 __slab_alloc+0x58/0xa0 mm/slub.c:3756 __slab_alloc_node mm/slub.c:3809 [inline] slab_alloc_node mm/slub.c:3988 [inline] kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4043 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:656 alloc_skb include/linux/skbuff.h:1314 [inline] nlmsg_new include/net/netlink.h:1015 [inline] inet6_netconf_notify_devconf+0xfc/0x1c0 net/ipv6/addrconf.c:589 __addrconf_sysctl_register+0x337/0x3a0 net/ipv6/addrconf.c:7226 addrconf_sysctl_register+0x167/0x1c0 net/ipv6/addrconf.c:7263 ipv6_add_dev+0xcf6/0x1220 net/ipv6/addrconf.c:456 addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3652 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] register_netdevice+0x1570/0x19e0 net/core/dev.c:10408 page last free pid 17038 tgid 17038 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_folios+0xf23/0x19e0 mm/page_alloc.c:2614 folios_put_refs+0x93a/0xa60 mm/swap.c:1024 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x44f/0xc80 mm/mmap.c:3354 __mmput+0x115/0x3c0 kernel/fork.c:1346 exit_mm+0x220/0x310 kernel/exit.c:565 do_exit+0x9aa/0x27e0 kernel/exit.c:861 do_group_exit+0x207/0x2c0 kernel/exit.c:1023 __do_sys_exit_group kernel/exit.c:1034 [inline] __se_sys_exit_group kernel/exit.c:1032 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807ac2e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ac2e980: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc >ffff88807ac2ea00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ac2ea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88807ac2eb00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================