================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:108 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 Read of size 4 at addr ffff8881c73aa488 by task syz-executor.2/15876 CPU: 1 PID: 15876 Comm: syz-executor.2 Tainted: G W 5.4.233-syzkaller-00032-g21086923c1e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] cleancache_invalidate_page include/linux/cleancache.h:108 [inline] unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 __delete_from_page_cache+0xc3/0x510 mm/filemap.c:237 __remove_mapping+0x46e/0x550 mm/vmscan.c:978 shrink_page_list+0x2467/0x3e70 mm/vmscan.c:1482 shrink_inactive_list+0x4f6/0xfd0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x396/0x12b0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x625/0x1280 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_max_write+0x235/0x3c0 mm/memcontrol.c:6220 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 7015: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x130/0x1d0 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0xfb/0x290 mm/slub.c:4449 kmemdup+0x21/0x50 mm/util.c:127 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3657 addrconf_sysctl_register+0xac/0x180 net/ipv6/addrconf.c:6988 ipv6_add_dev+0xc12/0x1070 net/ipv6/addrconf.c:445 addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3534 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] register_netdevice+0xeef/0x12a0 net/core/dev.c:9207 veth_newlink+0x833/0xb70 drivers/net/veth.c:1330 __rtnl_newlink net/core/rtnetlink.c:3230 [inline] rtnl_newlink+0x1511/0x2010 net/core/rtnetlink.c:3289 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5262 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2509 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1943 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] __sys_sendto+0x4f3/0x6c0 net/socket.c:1942 __do_sys_sendto net/socket.c:1954 [inline] __se_sys_sendto net/socket.c:1950 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:1950 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 5743: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x230 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0xeb/0x320 mm/slub.c:4071 addrconf_sysctl_unregister net/ipv6/addrconf.c:7004 [inline] addrconf_ifdown+0x17e3/0x1a40 net/ipv6/addrconf.c:3905 addrconf_notify+0x375/0xe50 net/ipv6/addrconf.c:3676 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] rollback_registered_many+0xc8a/0x12e0 net/core/dev.c:8617 unregister_netdevice_many net/core/dev.c:9774 [inline] default_device_exit_batch+0x3e0/0x680 net/core/dev.c:10245 ops_exit_list net/core/net_namespace.c:184 [inline] cleanup_net+0x6e2/0xc90 net/core/net_namespace.c:609 process_one_work+0x765/0xd20 kernel/workqueue.c:2287 worker_thread+0xaef/0x1470 kernel/workqueue.c:2433 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 The buggy address belongs to the object at ffff8881c73aa000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881c73aa000, ffff8881c73aa800) The buggy address belongs to the page: page:ffffea00071cea00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881c73aa000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea00073c6a08 ffffea0007062e08 ffff8881f5c0c000 raw: ffff8881c73aa000 0000000000080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2ce8/0x2d70 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x168/0x290 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x10d/0x1060 net/core/skbuff.c:1647 netlink_trim+0x198/0x230 net/netlink/af_netlink.c:1303 netlink_broadcast_filtered+0x62/0x1280 net/netlink/af_netlink.c:1508 netlink_broadcast net/netlink/af_netlink.c:1553 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2552 __dev_notify_flags+0xe3/0x510 net/core/dev.c:7959 dev_change_flags+0xe7/0x190 net/core/dev.c:8001 do_setlink+0xc4c/0x3b70 net/core/rtnetlink.c:2520 __rtnl_newlink net/core/rtnetlink.c:3163 [inline] rtnl_newlink+0x1666/0x2010 net/core/rtnetlink.c:3289 page_owner free stack trace missing Memory state around the buggy address: ffff8881c73aa380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c73aa400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881c73aa480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881c73aa500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c73aa580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.2 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 1 PID: 15876 Comm: syz-executor.2 Tainted: G B W 5.4.233-syzkaller-00032-g21086923c1e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 dump_header+0xd5/0x670 mm/oom_kill.c:460 oom_kill_process+0xeb/0x2c0 mm/oom_kill.c:974 out_of_memory+0x5e1/0x890 mm/oom_kill.c:1111 mem_cgroup_out_of_memory+0x211/0x270 mm/memcontrol.c:1611 memory_max_write+0x331/0x3c0 mm/memcontrol.c:6227 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 memory: usage 23668kB, limit 0kB, failcnt 0 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: anon 13770752 file 10637312 kernel_stack 0 slab 0 sock 32768 shmem 10498048 file_mapped 270336 file_dirty 0 file_writeback 0 anon_thp 0 inactive_anon 0 active_anon 24330240 inactive_file 184320 active_file 122880 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 3143679 pgmajfault 0 workingset_refault 66 workingset_activate 0 workingset_nodereclaim 0 pgrefill 7788 pgscan 8092 pgsteal 8006 pgactivate 3333 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz2,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor.1,pid=7702,uid=0 Memory cgroup out of memory: Killed process 7702 (syz-executor.1) total-vm:54800kB, anon-rss:4640kB, file-rss:14336kB, shmem-rss:0kB, UID:0 pgtables:96kB oom_score_adj:1000