================================================================== 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 ffff8881deb17488 by task syz-executor.3/20812 CPU: 1 PID: 20812 Comm: syz-executor.3 Not tainted 5.4.233-syzkaller-00030-ga6b5274af71b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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_high_write+0x16a/0x1b0 mm/memcontrol.c:6173 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 __kernel_write+0x10f/0x350 fs/read_write.c:515 write_pipe_buf+0x14a/0x1d0 fs/splice.c:794 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2a0/0x830 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] default_file_splice_write+0x19c/0x260 fs/splice.c:806 splice_direct_to_actor+0x497/0xae0 fs/splice.c:976 do_splice_direct+0x27f/0x3c0 fs/splice.c:1064 do_sendfile+0x854/0xee0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1511 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 17036: 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 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:759 [inline] kvmalloc_array include/linux/mm.h:777 [inline] alloc_fdtable+0xcb/0x240 fs/file.c:115 dup_fd+0x718/0xaa0 fs/file.c:310 copy_files+0xe1/0x1f0 kernel/fork.c:1474 copy_process+0x11e3/0x3230 kernel/fork.c:2029 _do_fork+0x197/0x900 kernel/fork.c:2391 __do_sys_clone kernel/fork.c:2549 [inline] __se_sys_clone kernel/fork.c:2530 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2530 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 20180: 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 __free_fdtable fs/file.c:31 [inline] put_files_struct+0x291/0x330 fs/file.c:420 do_exit+0xc78/0x2bc0 kernel/exit.c:854 do_group_exit+0x138/0x300 kernel/exit.c:982 get_signal+0xd94/0x13f0 kernel/signal.c:2735 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881deb17000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881deb17000, ffff8881deb17800) The buggy address belongs to the page: page:ffffea00077ac400 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881deb17000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0006e2b408 ffffea0007aeca08 ffff8881f5c0c000 raw: ffff8881deb17000 0000000000080006 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] __alloc_skb+0xb4/0x4d0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1079 [inline] nlmsg_new include/net/netlink.h:888 [inline] inet6_ifinfo_notify+0x69/0x110 net/ipv6/addrconf.c:5952 addrconf_notify+0xb3b/0xe50 net/ipv6/addrconf.c:3660 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 __dev_notify_flags+0x26e/0x510 net/core/dev.c:1670 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 last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x83d/0x940 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0xb4/0x150 mm/slub.c:2324 __slab_free+0x288/0x350 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1d0 mm/kasan/common.c:507 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+0x100/0x2b0 mm/slub.c:3909 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:154 ip6_route_info_create+0x458/0x1500 net/ipv6/route.c:3659 ip6_route_add+0x22/0x120 net/ipv6/route.c:3755 addrconf_add_mroute net/ipv6/addrconf.c:2491 [inline] addrconf_add_dev+0x41f/0x610 net/ipv6/addrconf.c:2509 addrconf_dev_config+0x1a7/0x320 net/ipv6/addrconf.c:3394 addrconf_notify+0x9d2/0xe50 net/ipv6/addrconf.c:3638 Memory state around the buggy address: ffff8881deb17380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881deb17400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881deb17480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881deb17500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881deb17580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================