================================================================== 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 ffff88802ae74008 by task syz-executor/10247 CPU: 1 UID: 0 PID: 10247 Comm: syz-executor Not tainted 6.15.0-syzkaller-08297-ge0797d3b91de #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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+0xda/0x190 fs/super.c:1349 vfs_get_tree+0x8b/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: 0033:0x7fad79b9010a 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:00007ffcf2adac28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fad79c10e74 RCX: 00007fad79b9010a RDX: 00007fad79c208cb RSI: 00007fad79c10e74 RDI: 00007fad79c208cb RBP: 00007fad79c110bd R08: 0000000000000000 R09: 00007fad79db6738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fad79bec1a8 R13: 00007fad79bec180 R14: 0000000000000009 R15: 0000000000000000 Allocated by task 10129: 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+0xda/0x190 fs/super.c:1349 vfs_get_tree+0x8b/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 5976: 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+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 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 ffff88802ae74000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff88802ae74000, ffff88802ae74200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae74 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 ffff88801b442c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b442c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0000ab9d01 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 5937, tgid 5937 (syz-executor), ts 51682443062, free_ts 51642000129 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1710 prep_new_page mm/page_alloc.c:1718 [inline] get_page_from_freelist+0x135c/0x3950 mm/page_alloc.c:3680 __alloc_frozen_pages_noprof+0x261/0x23f0 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+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] switchdev_deferred_enqueue+0x2b/0x2a0 net/switchdev/switchdev.c:117 switchdev_port_attr_set_defer net/switchdev/switchdev.c:183 [inline] switchdev_port_attr_set+0xb5/0x120 net/switchdev/switchdev.c:202 br_mc_disabled_update net/bridge/br_multicast.c:1993 [inline] br_multicast_add_port+0x178/0x3a0 net/bridge/br_multicast.c:2030 new_nbp net/bridge/br_if.c:445 [inline] br_add_if+0x5f5/0x1b70 net/bridge/br_if.c:599 do_set_master+0x40c/0x730 net/core/rtnetlink.c:2946 do_setlink.constprop.0+0xbd8/0x4380 net/core/rtnetlink.c:3148 rtnl_changelink net/core/rtnetlink.c:3759 [inline] __rtnl_newlink net/core/rtnetlink.c:3918 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 page last free pid 5937 tgid 5937 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1254 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2717 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_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] __kmalloc_cache_noprof+0x1f1/0x3e0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:203 __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline] netdev_hold include/linux/netdevice.h:4370 [inline] netdev_hold include/linux/netdevice.h:4365 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1973 [inline] netdev_queue_update_kobjects+0x2db/0x720 net/core/net-sysfs.c:2035 register_queue_kobjects net/core/net-sysfs.c:2098 [inline] netdev_register_kobject+0x28c/0x3a0 net/core/net-sysfs.c:2340 register_netdevice+0x13dc/0x2270 net/core/dev.c:11104 veth_newlink+0x446/0xa00 drivers/net/veth.c:1884 rtnl_newlink_create net/core/rtnetlink.c:3823 [inline] __rtnl_newlink net/core/rtnetlink.c:3940 [inline] rtnl_newlink+0xc42/0x2000 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 Memory state around the buggy address: ffff88802ae73f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802ae73f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802ae74000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802ae74080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802ae74100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================