================================================================== BUG: KASAN: slab-use-after-free in nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline] BUG: KASAN: slab-use-after-free in nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline] BUG: KASAN: slab-use-after-free in nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Read of size 2 at addr ffff88801c7239c4 by task kworker/0:0/8 CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events nf_tables_trans_destroy_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline] nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline] nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 process_one_work kernel/workqueue.c:3224 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305 worker_thread+0x86d/0xd40 kernel/workqueue.c:3383 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6875: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4189 kmalloc_noprof include/linux/slab.h:680 [inline] kzalloc_noprof include/linux/slab.h:806 [inline] nf_tables_newtable+0x52e/0x1dc0 net/netfilter/nf_tables_api.c:1465 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:522 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:644 [inline] nfnetlink_rcv+0x1427/0x2a90 net/netfilter/nfnetlink.c:662 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 ___sys_sendmsg net/socket.c:2651 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6874: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2231 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 nf_tables_table_destroy net/netfilter/nf_tables_api.c:1672 [inline] __nft_release_table+0xe80/0xf40 net/netfilter/nf_tables_api.c:11517 nft_rcv_nl_event+0x55f/0x6d0 net/netfilter/nf_tables_api.c:11576 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388 netlink_release+0x11a6/0x1b10 net/netlink/af_netlink.c:787 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:204 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2182 __queue_work+0xc16/0xee0 kernel/workqueue.c:2334 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2385 queue_work include/linux/workqueue.h:621 [inline] schedule_work include/linux/workqueue.h:682 [inline] __rhashtable_remove_fast_one include/linux/rhashtable.h:1069 [inline] __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline] rhltable_remove+0x1097/0x1160 include/linux/rhashtable.h:1144 nft_chain_commit_update net/netfilter/nf_tables_api.c:9483 [inline] nf_tables_commit+0x23c5/0x8a40 net/netfilter/nf_tables_api.c:10329 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:572 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:644 [inline] nfnetlink_rcv+0x1e44/0x2a90 net/netfilter/nfnetlink.c:662 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 ___sys_sendmsg net/socket.c:2651 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801c723800 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 452 bytes inside of freed 512-byte region [ffff88801c723800, ffff88801c723a00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c720 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88807bdc7801 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801504f140 ffffea0000940100 dead000000000002 raw: 0000000000000000 0000000080100010 00000001fdffffff ffff88807bdc7801 head: 00fff00000000040 ffff88801504f140 ffffea0000940100 dead000000000002 head: 0000000000000000 0000000080100010 00000001fdffffff ffff88807bdc7801 head: 00fff00000000002 ffffea000071c801 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4759, tgid 4759 (dhcpcd), ts 49447182286, free_ts 49431754796 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2ccb/0x2d80 mm/page_alloc.c:3480 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4738 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2300 allocate_slab+0x5a/0x2f0 mm/slub.c:2463 new_slab mm/slub.c:2516 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3702 __slab_alloc+0x58/0xa0 mm/slub.c:3792 __slab_alloc_node mm/slub.c:3845 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4177 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:605 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:674 alloc_skb include/linux/skbuff.h:1320 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6524 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2030 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 do_iter_readv_writev+0x60a/0x890 page last free pid 4758 tgid 4758 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2644 __folio_put+0x2c8/0x440 mm/swap.c:128 folio_put include/linux/mm.h:1487 [inline] free_large_kmalloc+0x105/0x1c0 mm/slub.c:4565 kfree+0x1c4/0x360 mm/slub.c:4588 skb_kfree_head net/core/skbuff.c:1082 [inline] skb_free_head net/core/skbuff.c:1094 [inline] skb_release_data+0x676/0x880 net/core/skbuff.c:1121 skb_release_all net/core/skbuff.c:1186 [inline] __kfree_skb net/core/skbuff.c:1200 [inline] consume_skb+0xb1/0x160 net/core/skbuff.c:1424 __unix_dgram_recvmsg+0xcea/0x12f0 net/unix/af_unix.c:2527 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0x22f/0x280 net/socket.c:1068 sock_read_iter+0x2ca/0x3e0 net/socket.c:1138 do_iter_readv_writev+0x60a/0x890 vfs_readv+0x2b6/0xa90 fs/read_write.c:932 do_readv+0x1b1/0x350 fs/read_write.c:994 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88801c723880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c723900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801c723980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c723a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c723a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================