================================================================== BUG: KASAN: use-after-free in nf_hook_entries_grow+0x5a7/0x700 net/netfilter/core.c:142 Read of size 4 at addr ffff88807ca0c638 by task syz-executor.1/22462 CPU: 1 PID: 22462 Comm: syz-executor.1 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x380 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:450 nf_hook_entries_grow+0x5a7/0x700 net/netfilter/core.c:142 __nf_register_net_hook+0x27e/0x8d0 net/netfilter/core.c:429 nf_register_net_hook+0xaa/0x180 net/netfilter/core.c:571 nft_register_flowtable_net_hooks+0x3c5/0x730 net/netfilter/nf_tables_api.c:7232 nf_tables_newflowtable+0x2022/0x2cf0 net/netfilter/nf_tables_api.c:7430 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:513 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:634 [inline] nfnetlink_rcv+0x10e6/0x2550 net/netfilter/nfnetlink.c:652 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0xaea/0xe60 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x280/0x370 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb6358d3e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb634249168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb6359e6f60 RCX: 00007fb6358d3e99 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007fb63592dff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdcca2ed3f R14: 00007fb634249300 R15: 0000000000022000 Allocated by task 22422: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x9d/0x330 mm/slub.c:3261 kmalloc include/linux/slab.h:590 [inline] nft_netdev_hook_alloc net/netfilter/nf_tables_api.c:1806 [inline] nf_tables_parse_netdev_hooks+0x195/0x730 net/netfilter/nf_tables_api.c:1860 nft_flowtable_parse_hook+0x45a/0x880 net/netfilter/nf_tables_api.c:7136 nf_tables_newflowtable+0x1c56/0x2cf0 net/netfilter/nf_tables_api.c:7421 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:513 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:634 [inline] nfnetlink_rcv+0x10e6/0x2550 net/netfilter/nfnetlink.c:652 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0xaea/0xe60 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x280/0x370 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 22420: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xe1/0x330 mm/slub.c:4561 nf_tables_flowtable_destroy+0x1fd/0x2a0 net/netfilter/nf_tables_api.c:7818 __nft_release_table+0x516/0xe70 net/netfilter/nf_tables_api.c:9621 nft_rcv_nl_event+0x497/0x570 net/netfilter/nf_tables_api.c:9688 notifier_call_chain kernel/notifier.c:83 [inline] blocking_notifier_call_chain+0x108/0x1b0 kernel/notifier.c:318 netlink_release+0xf57/0x1790 net/netlink/af_netlink.c:788 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xfa/0x130 mm/kasan/generic.c:348 kvfree_call_rcu+0x119/0x880 kernel/rcu/tree.c:3550 cfg80211_update_known_bss+0x174/0x9a0 cfg80211_bss_update+0x17a/0x2170 net/wireless/scan.c:1710 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2425 [inline] cfg80211_inform_bss_frame_data+0x8c2/0x1f40 net/wireless/scan.c:2458 ieee80211_bss_info_update+0x75b/0xbe0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline] ieee80211_ibss_rx_queued_mgmt+0x1690/0x2b30 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1468 [inline] ieee80211_iface_work+0x709/0xc90 net/mac80211/iface.c:1522 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xfa/0x130 mm/kasan/generic.c:348 kvfree_call_rcu+0x119/0x880 kernel/rcu/tree.c:3550 cfg80211_update_known_bss+0x174/0x9a0 cfg80211_bss_update+0x17a/0x2170 net/wireless/scan.c:1710 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2425 [inline] cfg80211_inform_bss_frame_data+0x8c2/0x1f40 net/wireless/scan.c:2458 ieee80211_bss_info_update+0x75b/0xbe0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline] ieee80211_ibss_rx_queued_mgmt+0x1690/0x2b30 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1468 [inline] ieee80211_iface_work+0x709/0xc90 net/mac80211/iface.c:1522 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88807ca0c600 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 56 bytes inside of 96-byte region [ffff88807ca0c600, ffff88807ca0c660) The buggy address belongs to the page: page:ffffea0001f28300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ca0c flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001d2ebc0 dead000000000002 ffff888011441780 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 865, ts 150946305645, free_ts 150780398206 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4149 __alloc_pages+0x255/0x580 mm/page_alloc.c:5369 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1930 new_slab mm/slub.c:1993 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:3022 __slab_alloc mm/slub.c:3109 [inline] slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] __kmalloc+0x2eb/0x380 mm/slub.c:4419 kmalloc include/linux/slab.h:595 [inline] kzalloc+0x1d/0x30 include/linux/slab.h:724 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2397 [inline] cfg80211_inform_bss_frame_data+0x427/0x1f40 net/wireless/scan.c:2458 ieee80211_bss_info_update+0x75b/0xbe0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline] ieee80211_ibss_rx_queued_mgmt+0x1690/0x2b30 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1468 [inline] ieee80211_iface_work+0x709/0xc90 net/mac80211/iface.c:1522 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xd1c/0xe00 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3388 do_slab_free mm/slub.c:3501 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3520 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc+0x1c9/0x310 mm/slub.c:3247 getname_flags+0xba/0x650 fs/namei.c:138 user_path_at_empty+0x2a/0x1a0 fs/namei.c:2800 do_readlinkat+0x11b/0x3b0 fs/stat.c:443 __do_sys_readlink fs/stat.c:476 [inline] __se_sys_readlink fs/stat.c:473 [inline] __x64_sys_readlink+0x7b/0x90 fs/stat.c:473 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88807ca0c500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88807ca0c580: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88807ca0c600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807ca0c680: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807ca0c700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================