================================================================== BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:1026 [inline] BUG: KASAN: slab-use-after-free in binder_add_device+0x5f/0xa0 drivers/android/binder.c:6932 Write of size 8 at addr ffff888024fb4808 by task syz-executor/12407 CPU: 1 UID: 0 PID: 12407 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 hlist_add_head include/linux/list.h:1026 [inline] binder_add_device+0x5f/0xa0 drivers/android/binder.c:6932 binderfs_binder_device_create+0x878/0xab0 drivers/android/binderfs.c:210 binderfs_fill_super+0x96e/0xe70 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xb9/0x140 fs/super.c:1299 vfs_get_tree+0x92/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 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: 0033:0x7ff42bf8e90a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdf8303678 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff42c00e663 RCX: 00007ff42bf8e90a RDX: 00007ff42c01dda7 RSI: 00007ff42c00e663 RDI: 00007ff42c01dda7 RBP: 00007ff42c00e8ac R08: 0000000000000000 R09: 00007ff42c1a6738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff42bfeb1a8 R13: 00007ff42bfeb180 R14: 0000000000000009 R15: 0000000000000000 Allocated by task 9278: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] switchdev_deferred_enqueue+0x4d/0x2a0 net/switchdev/switchdev.c:117 switchdev_port_obj_add_defer net/switchdev/switchdev.c:358 [inline] switchdev_port_obj_add+0x127/0x340 net/switchdev/switchdev.c:377 br_switchdev_host_mdb_one net/bridge/br_switchdev.c:559 [inline] br_switchdev_host_mdb net/bridge/br_switchdev.c:574 [inline] br_switchdev_mdb_notify+0x376/0x610 net/bridge/br_switchdev.c:649 br_mdb_notify+0x6e/0x9f0 net/bridge/br_mdb.c:529 br_multicast_host_join net/bridge/br_multicast.c:1482 [inline] __br_multicast_add_group+0x857/0xa20 net/bridge/br_multicast.c:1525 br_multicast_add_group net/bridge/br_multicast.c:1569 [inline] br_ip6_multicast_add_group net/bridge/br_multicast.c:1621 [inline] br_ip6_multicast_mld2_report net/bridge/br_multicast.c:2976 [inline] br_multicast_ipv6_rcv net/bridge/br_multicast.c:3914 [inline] br_multicast_rcv+0x3ff1/0x7ef0 net/bridge/br_multicast.c:3972 br_dev_xmit+0xb94/0x1b40 net/bridge/br_device.c:96 __netdev_start_xmit include/linux/netdevice.h:5151 [inline] netdev_start_xmit include/linux/netdevice.h:5160 [inline] xmit_one net/core/dev.c:3800 [inline] dev_hard_start_xmit+0x27c/0x7d0 net/core/dev.c:3816 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4649 dev_queue_xmit include/linux/netdevice.h:3313 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x127d/0x17c0 net/ipv6/ip6_output.c:141 ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314 mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1868 mld_send_cr net/ipv6/mcast.c:2169 [inline] mld_ifc_work+0x7d9/0xd90 net/ipv6/mcast.c:2702 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac0/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 9278: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x196/0x430 mm/slub.c:4757 switchdev_deferred_process+0x217/0x2d0 net/switchdev/switchdev.c:97 switchdev_deferred_process_work+0x13/0x20 net/switchdev/switchdev.c:105 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac0/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888024fb4800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff888024fb4800, ffff888024fb4a00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888024fb5400 pfn:0x24fb4 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b041c80 ffffea000160d710 ffffea0001f6c510 raw: ffff888024fb5400 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b041c80 ffffea000160d710 ffffea0001f6c510 head: ffff888024fb5400 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea000093ed01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12, tgid 12 (kworker/u8:0), ts 80982266449, free_ts 80829214446 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4740 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3766 ip6_route_add+0x28/0x160 net/ipv6/route.c:3858 addrconf_add_mroute net/ipv6/addrconf.c:2549 [inline] addrconf_add_dev+0x35b/0x540 net/ipv6/addrconf.c:2567 addrconf_dev_config net/ipv6/addrconf.c:3475 [inline] addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3563 addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736 notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85 netdev_state_change+0x11f/0x1a0 net/core/dev.c:1537 page last free pid 2994 tgid 2994 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 __slab_free+0x2c2/0x380 mm/slub.c:4520 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_noprof+0x236/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3766 ip6_route_add+0x28/0x160 net/ipv6/route.c:3858 addrconf_add_mroute net/ipv6/addrconf.c:2549 [inline] addrconf_add_dev+0x35b/0x540 net/ipv6/addrconf.c:2567 addrconf_dev_config net/ipv6/addrconf.c:3475 [inline] addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3563 addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736 notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85 netdev_state_change+0x11f/0x1a0 net/core/dev.c:1537 linkwatch_do_dev+0x112/0x170 net/core/link_watch.c:186 __linkwatch_run_queue+0x44f/0x6c0 net/core/link_watch.c:243 Memory state around the buggy address: ffff888024fb4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888024fb4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888024fb4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024fb4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024fb4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================