================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x14c/0x1c0 lib/list_debug.c:49 Read of size 8 at addr ffff8880684f8608 by task kworker/1:2/1806 CPU: 1 UID: 0 PID: 1806 Comm: kworker/1:2 Not tainted 6.11.0-syzkaller-12113-ge7ed34365879 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events binder_deferred_func 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:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 __list_del_entry_valid_or_report+0x14c/0x1c0 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] binder_dequeue_work_head_ilocked drivers/android/binder.c:540 [inline] binder_release_work+0x9b/0x490 drivers/android/binder.c:5110 binder_deferred_release drivers/android/binder.c:6261 [inline] binder_deferred_func+0xe6e/0x12e0 drivers/android/binder.c:6296 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6776: 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:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] binder_request_freeze_notification drivers/android/binder.c:3855 [inline] binder_thread_write+0xe19/0x4c60 drivers/android/binder.c:4485 binder_ioctl_write_read drivers/android/binder.c:5387 [inline] binder_ioctl+0x268b/0x7050 drivers/android/binder.c:5718 compat_ptr_ioctl+0x6b/0xa0 fs/ioctl.c:946 __do_compat_sys_ioctl+0x259/0x2b0 fs/ioctl.c:1007 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 1806: 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:579 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:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kfree+0x14f/0x4b0 mm/slub.c:4728 binder_free_ref drivers/android/binder.c:1355 [inline] binder_deferred_release drivers/android/binder.c:6256 [inline] binder_deferred_func+0xdd7/0x12e0 drivers/android/binder.c:6296 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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 ffff8880684f8600 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of freed 64-byte region [ffff8880684f8600, ffff8880684f8640) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x684f8 ksm flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801ac428c0 ffffea0001212480 dead000000000003 raw: 0000000000000000 0000000000200020 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5344, tgid 5344 (syz-executor), ts 99190196978, free_ts 99190178077 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2413 [inline] allocate_slab mm/slub.c:2579 [inline] new_slab+0x2ba/0x3f0 mm/slub.c:2632 ___slab_alloc+0xd1d/0x16f0 mm/slub.c:3819 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] __kmalloc_cache_node_noprof+0xf1/0x360 mm/slub.c:4304 kmalloc_node_noprof include/linux/slab.h:901 [inline] __get_vm_area_node+0xe1/0x2d0 mm/vmalloc.c:3106 __vmalloc_node_range_noprof+0x26a/0x15a0 mm/vmalloc.c:3788 __vmalloc_node_noprof mm/vmalloc.c:3893 [inline] vmalloc_noprof+0x6b/0x90 mm/vmalloc.c:3926 xt_compat_init_offsets+0xe1/0x1f0 net/netfilter/x_tables.c:733 compat_table_info+0xb7/0x5f0 net/ipv6/netfilter/ip6_tables.c:950 compat_get_entries+0x212/0x850 net/ipv6/netfilter/ip6_tables.c:1611 do_ip6t_get_ctl+0x596/0xaf0 net/ipv6/netfilter/ip6_tables.c:1674 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116 page last free pid 5344 tgid 5344 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638 vfree+0x17a/0x890 mm/vmalloc.c:3361 xt_compat_flush_offsets+0x8f/0x160 net/netfilter/x_tables.c:691 get_info+0x2f7/0x750 net/ipv6/netfilter/ip6_tables.c:988 do_ip6t_get_ctl+0x16a/0xaf0 net/ipv6/netfilter/ip6_tables.c:1668 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1f7/0x280 net/ipv6/ipv6_sockglue.c:1493 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4670 do_sock_getsockopt+0x3fe/0x870 net/socket.c:2391 __sys_getsockopt+0x1a1/0x270 net/socket.c:2420 __do_compat_sys_socketcall+0x42b/0x700 net/compat.c:494 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Memory state around the buggy address: ffff8880684f8500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880684f8580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880684f8600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880684f8680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880684f8700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================