================================================================== 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+0xa4/0xb0 drivers/android/binder.c:6932 Write of size 8 at addr ffff88807ec71408 by task syz-executor/8395 CPU: 1 UID: 0 PID: 8395 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 hlist_add_head include/linux/list.h:1026 [inline] binder_add_device+0xa4/0xb0 drivers/android/binder.c:6932 binderfs_binder_device_create.isra.0+0x95f/0xb70 drivers/android/binderfs.c:210 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xdd/0x190 fs/super.c:1299 vfs_get_tree+0x8e/0x340 fs/super.c:1759 do_new_mount fs/namespace.c:3884 [inline] path_mount+0x14d4/0x1f20 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f744799010a 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:00007ffff0437e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7447a10e74 RCX: 00007f744799010a RDX: 00007f7447a208cb RSI: 00007f7447a10e74 RDI: 00007f7447a208cb RBP: 00007f7447a110bd R08: 0000000000000000 R09: 00007f7447bb6738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74479ec1a8 R13: 00007f74479ec180 R14: 0000000000000009 R15: 0000000000000000 Allocated by task 8561: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] io_uring_alloc_task_context+0xa1/0x690 io_uring/tctx.c:77 __io_uring_add_tctx_node+0x2dd/0x500 io_uring/tctx.c:113 io_uring_create io_uring/io_uring.c:3780 [inline] io_uring_setup+0x157c/0x2090 io_uring/io_uring.c:3834 __do_sys_io_uring_setup io_uring/io_uring.c:3868 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3859 [inline] __x64_sys_io_uring_setup+0xc2/0x170 io_uring/io_uring.c:3859 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kfree+0x2b6/0x4d0 mm/slub.c:4841 __io_uring_free+0x13b/0x1e0 io_uring/tctx.c:67 io_uring_free include/linux/io_uring.h:29 [inline] __put_task_struct+0xfb/0x530 kernel/fork.c:995 put_task_struct include/linux/sched/task.h:145 [inline] put_task_struct include/linux/sched/task.h:132 [inline] delayed_put_task_struct+0x115/0x2e0 kernel/exit.c:225 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 run_ksoftirqd kernel/softirq.c:968 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:164 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88807ec71400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff88807ec71400, ffff88807ec71600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ec70 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b441c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b441c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001fb1c01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 12, tgid 12 (kworker/u8:0), ts 115356343451, free_ts 115198389287 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab mm/slub.c:2618 [inline] new_slab+0x244/0x340 mm/slub.c:2672 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948 __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __do_kmalloc_node mm/slub.c:4326 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x33f/0x18e0 net/ipv6/route.c:3802 ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3896 addrconf_prefix_route+0x2fd/0x510 net/ipv6/addrconf.c:2487 addrconf_add_linklocal+0x329/0x500 net/ipv6/addrconf.c:3315 addrconf_addr_gen+0x36d/0x3c0 net/ipv6/addrconf.c:3444 addrconf_dev_config net/ipv6/addrconf.c:3490 [inline] addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3568 addrconf_notify+0x6e2/0x19e0 net/ipv6/addrconf.c:3741 page last free pid 5832 tgid 5832 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_node_noprof+0x1d5/0x3b0 mm/slub.c:4248 __alloc_skb+0x2b2/0x380 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1340 [inline] netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1187 netlink_sendmsg+0x6a1/0xdd0 net/netlink/af_netlink.c:1858 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x498/0x510 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807ec71300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ec71380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807ec71400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ec71480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ec71500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================