================================================================== BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:945 [inline] BUG: KASAN: slab-use-after-free in enqueue_timer+0x4df/0x520 kernel/time/timer.c:605 Write of size 8 at addr ffff88804e78d500 by task ksoftirqd/0/15 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.3.0-syzkaller-07934-g415d7a49cd79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 hlist_add_head include/linux/list.h:945 [inline] enqueue_timer+0x4df/0x520 kernel/time/timer.c:605 internal_add_timer kernel/time/timer.c:634 [inline] __mod_timer+0x8b5/0xe80 kernel/time/timer.c:1131 mod_peer_timer+0x13f/0x2d0 drivers/net/wireguard/timers.c:37 wg_timers_any_authenticated_packet_traversal+0x94/0xb0 drivers/net/wireguard/timers.c:215 wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline] wg_packet_rx_poll+0x947/0x1f50 drivers/net/wireguard/receive.c:474 __napi_poll+0xb7/0x6f0 net/core/dev.c:6496 napi_poll net/core/dev.c:6563 [inline] net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:939 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:931 smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 6204: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0x61/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:580 [inline] kvmalloc_node+0x76/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:698 [inline] kvzalloc include/linux/slab.h:706 [inline] alloc_netdev_mqs+0x9c/0x1250 net/core/dev.c:10626 rtnl_create_link+0xbeb/0xee0 net/core/rtnetlink.c:3315 rtnl_newlink_create net/core/rtnetlink.c:3433 [inline] __rtnl_newlink+0xfd4/0x1840 net/core/rtnetlink.c:3660 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3673 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6395 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 __sys_sendto+0x23a/0x340 net/socket.c:2144 __do_sys_sendto net/socket.c:2156 [inline] __se_sys_sendto net/socket.c:2152 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2152 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5199: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800 kvfree+0x46/0x50 mm/util.c:649 device_release+0xa3/0x240 drivers/base/core.c:2436 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:729 netdev_run_todo+0x762/0x1100 net/core/dev.c:10400 default_device_exit_batch+0x456/0x5b0 net/core/dev.c:11392 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 insert_work+0x48/0x350 kernel/workqueue.c:1361 __queue_work+0x625/0x1120 kernel/workqueue.c:1524 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 insert_work+0x48/0x350 kernel/workqueue.c:1361 __queue_work+0x625/0x1120 kernel/workqueue.c:1524 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 The buggy address belongs to the object at ffff88804e78c000 which belongs to the cache kmalloc-cg-8k of size 8192 The buggy address is located 5376 bytes inside of freed 8192-byte region [ffff88804e78c000, ffff88804e78e000) The buggy address belongs to the physical page: page:ffffea000139e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e788 head:ffffea000139e200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888021a79b81 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff88801244f640 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000020002 00000001ffffffff ffff888021a79b81 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), pid 5889, tgid 5882 (syz-executor.3), ts 269395526958, free_ts 269345415006 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:2546 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2277 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:580 [inline] __bpf_map_area_alloc+0x157/0x180 kernel/bpf/syscall.c:330 htab_map_alloc+0x370/0x1640 kernel/bpf/hashtab.c:520 find_and_alloc_map kernel/bpf/syscall.c:135 [inline] map_create+0x508/0x1860 kernel/bpf/syscall.c:1161 __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040 __do_sys_bpf kernel/bpf/syscall.c:5162 [inline] __se_sys_bpf kernel/bpf/syscall.c:5160 [inline] __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1454 [inline] free_pcp_prepare+0x5da/0xa60 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3483 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x17c/0x3b0 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:671 [inline] alloc_buffer_head+0x24/0x150 fs/buffer.c:2943 alloc_page_buffers+0x284/0x790 fs/buffer.c:871 create_empty_buffers+0x30/0xf30 fs/buffer.c:1585 ext4_block_write_begin+0xb9c/0xde0 fs/ext4/inode.c:1040 ext4_da_write_begin+0x495/0x8b0 fs/ext4/inode.c:2916 generic_perform_write+0x256/0x570 mm/filemap.c:3926 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 Memory state around the buggy address: ffff88804e78d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804e78d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804e78d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804e78d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804e78d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================