================================================================== 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+0x6e6/0x750 mm/filemap.c:169 Read of size 4 at addr ffff8881e93b6488 by task syz-executor.0/31232 CPU: 1 PID: 31232 Comm: syz-executor.0 Tainted: G W 5.4.233-syzkaller-00005-g3ca47ce937f0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023 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+0x6e6/0x750 mm/filemap.c:169 __delete_from_page_cache+0xd0/0x600 mm/filemap.c:237 __remove_mapping+0x4a2/0x590 mm/vmscan.c:978 shrink_page_list+0x22f9/0x42c0 mm/vmscan.c:1482 shrink_inactive_list+0x533/0xfe0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x389/0x14a0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x63f/0x12b0 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_max_write+0x23a/0x440 mm/memcontrol.c:6220 cgroup_file_write+0x275/0x5f0 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 26719: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 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+0x100/0x2b0 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] alloc_skb_with_frags+0x92/0x550 net/core/skbuff.c:5811 sock_alloc_send_pskb+0x831/0x950 net/core/sock.c:2261 mld_newpack+0x1b2/0x990 net/ipv6/mcast.c:1607 add_grhead net/ipv6/mcast.c:1710 [inline] add_grec+0xec5/0x12f0 net/ipv6/mcast.c:1841 mld_send_initial_cr+0x1e4/0x2b0 net/ipv6/mcast.c:2091 ipv6_mc_dad_complete+0x70/0x3a0 net/ipv6/mcast.c:2103 addrconf_dad_completed+0x73f/0xe30 net/ipv6/addrconf.c:4231 addrconf_dad_work+0xe4d/0x16f0 net/ipv6/addrconf.c:4016 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 Freed by task 26719: 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+0x1b5/0x270 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+0x123/0x370 mm/slub.c:4071 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb net/core/skbuff.c:689 [inline] kfree_skb+0xb8/0x3c0 net/core/skbuff.c:708 ip6_mc_input+0x236/0x2a0 net/ipv6/ip6_input.c:550 NF_HOOK include/linux/netfilter.h:308 [inline] ipv6_rcv+0xee/0x280 net/ipv6/ip6_input.c:278 __netif_receive_skb_one_core net/core/dev.c:4958 [inline] __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5072 process_backlog+0x34f/0x680 net/core/dev.c:5907 napi_poll net/core/dev.c:6353 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6421 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881e93b6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881e93b6000, ffff8881e93b6800) The buggy address belongs to the page: page:ffffea0007a4ec00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881e93b5000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0007832808 ffffea000783ec08 ffff8881f5c0c000 raw: ffff8881e93b5000 0000000000080003 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) 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+0x2d13/0x2d90 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+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0x12d/0x260 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] copy_verifier_state+0x581/0xbf0 kernel/bpf/verifier.c:746 push_stack+0x153/0x470 kernel/bpf/verifier.c:819 check_cond_jmp_op+0x719/0x17d0 kernel/bpf/verifier.c:6172 do_check+0x4ba1/0x9820 kernel/bpf/verifier.c:8089 bpf_check+0x2169/0xb340 kernel/bpf/verifier.c:9617 bpf_prog_load kernel/bpf/syscall.c:1724 [inline] __do_sys_bpf kernel/bpf/syscall.c:2891 [inline] __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 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+0x847/0x950 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 __slab_free+0x34b/0x360 mm/slub.c:3012 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 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] kmem_cache_alloc_trace+0xdc/0x260 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] ____ip_mc_inc_group+0x205/0x8d0 net/ipv4/igmp.c:1444 __ip_mc_inc_group net/ipv4/igmp.c:1479 [inline] ip_mc_inc_group net/ipv4/igmp.c:1485 [inline] ip_mc_up+0x10b/0x1e0 net/ipv4/igmp.c:1784 inetdev_event+0xbed/0x1040 net/ipv4/devinet.c:1574 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_group_changelink net/core/rtnetlink.c:3010 [inline] __rtnl_newlink net/core/rtnetlink.c:3168 [inline] rtnl_newlink+0x10fb/0x2010 net/core/rtnetlink.c:3289 Memory state around the buggy address: ffff8881e93b6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e93b6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e93b6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e93b6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e93b6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================