================================================================== 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 ffff88807a4e3c08 by task syz-executor/21820 CPU: 1 UID: 0 PID: 21820 Comm: syz-executor Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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+0xcd/0x680 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+0xa03/0xc30 drivers/android/binderfs.c:210 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1330 [inline] get_tree_nodev+0xdd/0x190 fs/super.c:1349 vfs_get_tree+0x8e/0x340 fs/super.c:1809 do_new_mount fs/namespace.c:3882 [inline] path_mount+0x14d4/0x1f70 fs/namespace.c:4209 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount fs/namespace.c:4410 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd7cdf9010a 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:00007ffd6a772c08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd7ce010e74 RCX: 00007fd7cdf9010a RDX: 00007fd7ce0208cb RSI: 00007fd7ce010e74 RDI: 00007fd7ce0208cb RBP: 00007fd7ce0110bd R08: 0000000000000000 R09: 00007fd7ce1b6738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd7cdfec1a8 R13: 00007fd7cdfec180 R14: 0000000000000009 R15: 0000000000000000 Allocated by task 20287: 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] binderfs_binder_device_create.isra.0+0x189/0xc30 drivers/android/binderfs.c:147 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730 vfs_get_super fs/super.c:1330 [inline] get_tree_nodev+0xdd/0x190 fs/super.c:1349 vfs_get_tree+0x8e/0x340 fs/super.c:1809 do_new_mount fs/namespace.c:3882 [inline] path_mount+0x14d4/0x1f70 fs/namespace.c:4209 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount fs/namespace.c:4410 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 21710: 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+0x2b4/0x4d0 mm/slub.c:4841 binder_free_proc drivers/android/binder.c:5248 [inline] binder_proc_dec_tmpref drivers/android/binder.c:1565 [inline] binder_proc_dec_tmpref+0x4c3/0x590 drivers/android/binder.c:1558 binder_deferred_release drivers/android/binder.c:6292 [inline] binder_deferred_func+0xe87/0x12c0 drivers/android/binder.c:6319 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88807a4e3c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff88807a4e3c00, ffff88807a4e3e00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807a4e2400 pfn:0x7a4e0 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 ffff88801b441c80 ffffea0000cb7710 ffffea000076e010 raw: ffff88807a4e2400 000000000010000b 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b441c80 ffffea0000cb7710 ffffea000076e010 head: ffff88807a4e2400 000000000010000b 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001e93801 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5847, tgid 5847 (syz-executor), ts 115510655106, free_ts 115425743380 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x135c/0x3950 mm/page_alloc.c:3684 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4974 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+0x23b/0x330 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 inet6_addr_add+0x589/0x960 net/ipv6/addrconf.c:3052 inet6_rtm_newaddr+0x1619/0x1c70 net/ipv6/addrconf.c:5063 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x16d/0x440 net/netlink/af_netlink.c:2534 page last free pid 5894 tgid 5894 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1258 [inline] __free_frozen_pages+0x7f8/0x1180 mm/page_alloc.c:2721 discard_slab mm/slub.c:2716 [inline] __put_partials+0x16d/0x1c0 mm/slub.c:3185 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x8a/0xb0 mm/kasan/common.c:385 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] tomoyo_dump_page+0x4a4/0x720 security/tomoyo/domain.c:915 tomoyo_scan_bprm security/tomoyo/condition.c:130 [inline] tomoyo_condition+0x736/0x3bd0 security/tomoyo/condition.c:1120 tomoyo_check_acl+0x1b7/0x410 security/tomoyo/domain.c:177 tomoyo_execute_permission+0x176/0x4b0 security/tomoyo/file.c:615 tomoyo_find_next_domain+0x38d/0x20b0 security/tomoyo/domain.c:762 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:102 [inline] tomoyo_bprm_check_security+0x12e/0x1d0 security/tomoyo/tomoyo.c:92 security_bprm_check+0x1b9/0x1e0 security/security.c:1302 search_binary_handler fs/exec.c:1708 [inline] exec_binprm fs/exec.c:1750 [inline] bprm_execve fs/exec.c:1802 [inline] bprm_execve+0x810/0x1650 fs/exec.c:1778 kernel_execve+0x2ef/0x3b0 fs/exec.c:1968 call_usermodehelper_exec_async+0x255/0x4c0 kernel/umh.c:109 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 Memory state around the buggy address: ffff88807a4e3b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a4e3b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807a4e3c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a4e3c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a4e3d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================