================================================================== 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 ffff8881ea6a8488 by task syz-executor.4/10698 CPU: 0 PID: 10698 Comm: syz-executor.4 Not tainted 5.4.233-syzkaller-00007-ge7141bb18b62 #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 10183: 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 mld_dad_timer_expire+0x2b/0x3e0 net/ipv6/mcast.c:2115 call_timer_fn+0x36/0x390 kernel/time/timer.c:1418 expire_timers kernel/time/timer.c:1463 [inline] __run_timers+0x879/0xbe0 kernel/time/timer.c:1787 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 Freed by task 10183: 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 ffff8881ea6a8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881ea6a8000, ffff8881ea6a8800) The buggy address belongs to the page: page:ffffea0007a9aa00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5c0c000 raw: 0000000000000000 0000000000080008 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] __kmalloc_track_caller+0x16d/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] nlmsg_new include/net/netlink.h:888 [inline] rtmsg_ifinfo_build_skb+0x81/0x180 net/core/rtnetlink.c:3503 rollback_registered_many+0xd72/0x1330 net/core/dev.c:8621 unregister_netdevice_many+0x46/0x250 net/core/dev.c:9774 ip_tunnel_delete_nets+0x33b/0x380 net/ipv4/ip_tunnel.c:1115 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 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 put_page include/linux/mm.h:1151 [inline] page_to_skb+0x3fd/0x930 drivers/net/virtio_net.c:453 receive_mergeable drivers/net/virtio_net.c:997 [inline] receive_buf+0xddd/0x5170 drivers/net/virtio_net.c:1107 virtnet_receive drivers/net/virtio_net.c:1399 [inline] virtnet_poll+0x5f3/0x1250 drivers/net/virtio_net.c:1508 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 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1086 Memory state around the buggy address: ffff8881ea6a8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ea6a8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881ea6a8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ea6a8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ea6a8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.4 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 PID: 10698 Comm: syz-executor.4 Tainted: G B 5.4.233-syzkaller-00007-ge7141bb18b62 #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 dump_header+0xd5/0x6b0 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+0x329/0x440 mm/memcontrol.c:6227 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 memory: usage 27144kB, limit 0kB, failcnt 3 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: anon 19353600 file 8339456 kernel_stack 0 slab 0 sock 16384 shmem 8368128 file_mapped 135168 file_dirty 0 file_writeback 0 anon_thp 0 inactive_anon 8380416 active_anon 19464192 inactive_file 135168 active_file 126976 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 449493 pgmajfault 0 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 111 pgscan 112 pgsteal 0 pgactivate 891 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz4,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor.1,pid=6542,uid=0 Memory cgroup out of memory: Killed process 6542 (syz-executor.1) total-vm:54800kB, anon-rss:15532kB, file-rss:14336kB, shmem-rss:0kB, UID:0 pgtables:120kB oom_score_adj:1000