================================================================== BUG: KASAN: slab-use-after-free in kernfs_test_super+0x122/0x150 fs/kernfs/mount.c:286 Read of size 8 at addr ffff888041034108 by task syz-executor.1/11308 CPU: 0 PID: 11308 Comm: syz-executor.1 Not tainted 6.5.0-syzkaller-00453-g727dbda16b83 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 kernfs_test_super+0x122/0x150 fs/kernfs/mount.c:286 sget_fc+0x582/0x9b0 fs/super.c:778 kernfs_get_tree+0x198/0x990 fs/kernfs/mount.c:337 sysfs_get_tree+0x41/0x140 fs/sysfs/mount.c:31 vfs_get_tree+0x8c/0x370 fs/super.c:1711 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7facec07cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faceccf20c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007facec19c050 RCX: 00007facec07cae9 RDX: 00000000200002c0 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00007facec0c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007facec19c050 R15: 00007facec2bfa48 Allocated by task 11266: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:582 [inline] kzalloc include/linux/slab.h:703 [inline] kernfs_get_tree+0x78/0x990 fs/kernfs/mount.c:328 sysfs_get_tree+0x41/0x140 fs/sysfs/mount.c:31 vfs_get_tree+0x8c/0x370 fs/super.c:1711 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5053: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3814 sysfs_kill_sb+0x21/0x30 fs/sysfs/mount.c:86 deactivate_locked_super+0xa0/0x2d0 fs/super.c:454 deactivate_super+0xde/0x100 fs/super.c:504 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3368 sctp_bind_addr_clean+0x133/0x1f0 net/sctp/bind_addr.c:131 sctp_endpoint_destroy net/sctp/endpointola.c:219 [inline] sctp_endpoint_put+0x10b/0x200 net/sctp/endpointola.c:243 sctp_destroy_sock+0xa6/0x400 net/sctp/socket.c:5100 sk_common_release+0x68/0x3a0 net/core/sock.c:3704 sctp_close+0x4dc/0x940 net/sctp/socket.c:1549 inet_release+0x132/0x270 net/ipv4/af_inet.c:427 inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:480 __sock_release+0xcd/0x290 net/socket.c:654 sock_close+0x1c/0x20 net/socket.c:1386 __fput+0x3f7/0xa70 fs/file_table.c:384 __fput_sync+0x47/0x50 fs/file_table.c:465 __do_sys_close fs/open.c:1572 [inline] __se_sys_close fs/open.c:1557 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1557 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3368 tcf_exts_miss_cookie_base_destroy net/sched/cls_api.c:120 [inline] tcf_exts_destroy+0x86/0x160 net/sched/cls_api.c:3250 __fl_destroy_filter+0x69/0x170 net/sched/cls_flower.c:423 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 worker_thread+0x687/0x1110 kernel/workqueue.c:2751 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888041034100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of freed 64-byte region [ffff888041034100, ffff888041034140) The buggy address belongs to the physical page: page:ffffea0001040d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41034 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888012841640 ffffea000087e600 dead000000000004 raw: 0000000000000000 0000000000200020 00000001ffffffff 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4328, tgid 4327 (syz-executor.5), ts 1203117209132, free_ts 1197191179845 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3509 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1076 kmalloc include/linux/slab.h:582 [inline] kzalloc include/linux/slab.h:703 [inline] sctp_add_bind_addr+0x9d/0x3e0 net/sctp/bind_addr.c:150 sctp_copy_local_addr_list+0x3a0/0x5b0 net/sctp/protocol.c:165 sctp_copy_one_addr net/sctp/bind_addr.c:466 [inline] sctp_bind_addr_copy+0xe0/0x530 net/sctp/bind_addr.c:56 sctp_connect_new_asoc+0x1d3/0x780 net/sctp/socket.c:1094 __sctp_connect+0x3e7/0xc30 net/sctp/socket.c:1196 sctp_connect net/sctp/socket.c:4810 [inline] sctp_inet_connect+0x15f/0x1f0 net/sctp/socket.c:4825 __sys_connect_file+0x15b/0x1a0 net/socket.c:1992 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443 vfree+0x181/0x7a0 mm/vmalloc.c:2842 dvb_dmxdev_release+0x20a/0x6b0 drivers/media/dvb-core/dmxdev.c:1472 dvb_usb_adapter_dvb_exit+0x97/0x230 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:224 dvb_usb_adapter_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:128 [inline] dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline] dvb_usb_device_exit+0x266/0x560 drivers/media/usb/dvb-usb/dvb-usb-init.c:338 usb_unbind_interface+0x1dd/0x8d0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1270 [inline] device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1293 bus_remove_device+0x22c/0x420 drivers/base/bus.c:574 device_del+0x39a/0xa40 drivers/base/core.c:3814 usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1420 usb_disconnect+0x2e1/0x890 drivers/usb/core/hub.c:2253 hub_port_connect drivers/usb/core/hub.c:5261 [inline] hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] port_event drivers/usb/core/hub.c:5726 [inline] hub_event+0x21bd/0x5230 drivers/usb/core/hub.c:5808 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 process_scheduled_works kernel/workqueue.c:2667 [inline] worker_thread+0x896/0x1110 kernel/workqueue.c:2753 Memory state around the buggy address: ffff888041034000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888041034080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888041034100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888041034180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888041034200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================