================================================================== 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 ffff8881ae5e6488 by task syz-executor.5/28241 CPU: 0 PID: 28241 Comm: syz-executor.5 Not tainted 5.4.233-syzkaller-00031-gd229b250494c #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 try_charge+0x505/0x14e0 mm/memcontrol.c:2616 mem_cgroup_try_charge+0x249/0x370 mm/memcontrol.c:6582 __add_to_page_cache_locked+0x22e/0x8f0 mm/filemap.c:865 add_to_page_cache_lru+0x117/0x2c0 mm/filemap.c:962 pagecache_get_page+0x50a/0x750 mm/filemap.c:1701 grab_cache_page_write_begin+0x51/0x90 mm/filemap.c:3261 ext4_da_write_begin+0x58d/0xfe0 fs/ext4/inode.c:3153 generic_perform_write+0x2c7/0x560 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x499/0x10e0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1981 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5d3/0x750 fs/read_write.c:496 __kernel_write+0x10f/0x350 fs/read_write.c:515 dump_emit+0x213/0x350 fs/coredump.c:838 elf_core_dump+0x3e06/0x4730 fs/binfmt_elf.c:2352 do_coredump+0x1fd7/0x2da0 fs/coredump.c:801 get_signal+0xd66/0x13f0 kernel/signal.c:2729 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 retint_user+0x8/0x8 Allocated by task 26143: 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 include/linux/slab.h:561 [inline] sk_prot_alloc+0xbd/0x3e0 net/core/sock.c:1618 sk_alloc+0x30/0x3a0 net/core/sock.c:1676 __netlink_create net/netlink/af_netlink.c:638 [inline] netlink_create+0x3e3/0x630 net/netlink/af_netlink.c:701 __sock_create+0x3cb/0x7a0 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x132/0x370 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 9: 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 sk_prot_free net/core/sock.c:1659 [inline] __sk_destruct+0x5b7/0x5e0 net/core/sock.c:1745 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167 rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387 __do_softirq+0x22e/0x630 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881ae5e6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881ae5e6000, ffff8881ae5e6800) The buggy address belongs to the page: page:ffffea0006b97800 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881ae5e2000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0007ae5408 ffffea0006a50008 ffff8881f5c0c000 raw: ffff8881ae5e2000 0000000000080002 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 0x1d2a20(GFP_ATOMIC|__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+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] alloc_skb_with_frags+0x9c/0x560 net/core/skbuff.c:5812 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_cr net/ipv6/mcast.c:1967 [inline] mld_ifc_timer_expire+0x73d/0xc10 net/ipv6/mcast.c:2474 call_timer_fn+0x36/0x390 kernel/time/timer.c:1418 expire_timers kernel/time/timer.c:1463 [inline] __run_timers+0x7c2/0xae0 kernel/time/timer.c:1787 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_thread_stack kernel/fork.c:299 [inline] release_task_stack kernel/fork.c:439 [inline] put_task_stack+0x212/0x260 kernel/fork.c:450 finish_task_switch+0x241/0x560 kernel/sched/core.c:3476 context_switch kernel/sched/core.c:3608 [inline] __schedule+0xb03/0x12a0 kernel/sched/core.c:4304 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:4453 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:4478 ___preempt_schedule+0x16/0x20 arch/x86/entry/thunk_64.S:50 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x6f/0x80 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] __wake_up_common_lock kernel/sched/wait.c:125 [inline] __wake_up_sync_key+0x13b/0x1e0 kernel/sched/wait.c:196 unix_dgram_recvmsg+0x432/0x1120 net/unix/af_unix.c:2163 ____sys_recvmsg net/socket.c:2519 [inline] ___sys_recvmsg+0x6a7/0xa60 net/socket.c:2560 do_recvmmsg+0x418/0x940 net/socket.c:2671 __sys_recvmmsg net/socket.c:2750 [inline] __do_sys_recvmmsg net/socket.c:2773 [inline] __se_sys_recvmmsg net/socket.c:2766 [inline] __x64_sys_recvmmsg+0x195/0x240 net/socket.c:2766 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881ae5e6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ae5e6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881ae5e6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ae5e6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ae5e6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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