================================================================== 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 ffff8881e6be9488 by task syz-executor.3/10300 CPU: 0 PID: 10300 Comm: syz-executor.3 Not tainted 5.4.233-syzkaller-00022-gcf4e000017b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 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_high_write+0x176/0x260 mm/memcontrol.c:6173 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 __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 10261: 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 __pskb_copy_fclone+0xaa/0x10d0 net/core/skbuff.c:1572 __pskb_copy include/linux/skbuff.h:1143 [inline] tipc_sk_mcast_rcv+0x765/0x1200 net/tipc/socket.c:1202 tipc_mcast_xmit+0x14d3/0x1c30 net/tipc/bcast.c:417 tipc_sendmcast net/tipc/socket.c:831 [inline] __tipc_sendmsg+0x2ac5/0x37b0 net/tipc/socket.c:1372 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1305 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xf5/0x130 net/socket.c:678 sock_no_sendpage+0x144/0x1b0 net/core/sock.c:2778 kernel_sendpage net/socket.c:3755 [inline] sock_sendpage+0xd1/0x120 net/socket.c:936 pipe_to_sendpage+0x242/0x310 fs/splice.c:449 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] generic_splice_sendpage+0x195/0x220 fs/splice.c:829 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 Freed by task 10261: 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 tipc_msg_reverse+0x6cc/0x960 net/tipc/msg.c:603 tipc_sk_filter_rcv+0x13a2/0x2990 net/tipc/socket.c:2227 tipc_sk_enqueue net/tipc/socket.c:2295 [inline] tipc_sk_rcv+0x77a/0x1cd0 net/tipc/socket.c:2346 tipc_sk_mcast_rcv+0x10fd/0x1200 net/tipc/socket.c:1223 tipc_mcast_xmit+0x14d3/0x1c30 net/tipc/bcast.c:417 tipc_sendmcast net/tipc/socket.c:831 [inline] __tipc_sendmsg+0x2ac5/0x37b0 net/tipc/socket.c:1372 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1305 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xf5/0x130 net/socket.c:678 sock_no_sendpage+0x144/0x1b0 net/core/sock.c:2778 kernel_sendpage net/socket.c:3755 [inline] sock_sendpage+0xd1/0x120 net/socket.c:936 pipe_to_sendpage+0x242/0x310 fs/splice.c:449 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] generic_splice_sendpage+0x195/0x220 fs/splice.c:829 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 The buggy address belongs to the object at ffff8881e6be8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 5256 bytes inside of 8192-byte region [ffff8881e6be8000, ffff8881e6bea000) The buggy address belongs to the page: page:ffffea00079afa00 refcount:1 mapcount:0 mapping:ffff8881f5c0c500 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c0c500 raw: 0000000000000000 0000000000020002 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+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 skb_copy+0xe6/0x760 net/core/skbuff.c:1532 skb_unshare include/linux/skbuff.h:1770 [inline] tipc_buf_append+0x581/0xa30 net/tipc/msg.c:146 tipc_msg_reassemble+0x37e/0x640 net/tipc/msg.c:721 tipc_mcast_xmit+0x243/0x1c30 net/tipc/bcast.c:385 tipc_sendmcast net/tipc/socket.c:831 [inline] __tipc_sendmsg+0x2ac5/0x37b0 net/tipc/socket.c:1372 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1305 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xf5/0x130 net/socket.c:678 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 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+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 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+0xd9/0x250 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 getname fs/namei.c:212 [inline] do_symlinkat+0xa1/0x400 fs/namei.c:4224 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881e6be9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e6be9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e6be9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e6be9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e6be9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================