================================================================== BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline] BUG: KASAN: use-after-free in cpu_map_enqueue+0xb6/0x370 kernel/bpf/cpumap.c:775 Read of size 8 at addr ffff888077e0ee08 by task syz.3.159/4174 CPU: 0 PID: 4174 Comm: syz.3.159 Not tainted 6.1.106-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 bq_enqueue kernel/bpf/cpumap.c:749 [inline] cpu_map_enqueue+0xb6/0x370 kernel/bpf/cpumap.c:775 __xdp_do_redirect_frame net/core/filter.c:4298 [inline] xdp_do_redirect_frame+0x2f0/0x660 net/core/filter.c:4356 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xbf4/0x1ea0 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3685 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5038 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fccbf179e79 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fccbffc2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fccbf315f80 RCX: 00007fccbf179e79 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007fccbf1e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fccbf315f80 R15: 00007ffcd6483278 Allocated by task 4019: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0xb3/0x230 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:582 [inline] bpf_map_kmalloc_node+0xce/0x1c0 kernel/bpf/syscall.c:452 __cpu_map_entry_alloc kernel/bpf/cpumap.c:445 [inline] cpu_map_update_elem+0x277/0xf60 kernel/bpf/cpumap.c:603 map_update_elem+0x503/0x680 kernel/bpf/syscall.c:1463 __sys_bpf+0x337/0x6c0 kernel/bpf/syscall.c:5008 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 4021: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 put_cpu_map_entry+0x6eb/0x760 kernel/bpf/cpumap.c:161 cpu_map_kthread_run+0x2887/0x2940 kernel/bpf/cpumap.c:408 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 queue_work_on+0x14b/0x250 kernel/workqueue.c:1548 cpu_map_free+0xd7/0x1b0 kernel/bpf/cpumap.c:641 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2844 __cpu_map_entry_replace+0x74/0x170 kernel/bpf/cpumap.c:556 cpu_map_free+0xd7/0x1b0 kernel/bpf/cpumap.c:641 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888077e0ee00 which belongs to the cache kmalloc-cg-256 of size 256 The buggy address is located 8 bytes inside of 256-byte region [ffff888077e0ee00, ffff888077e0ef00) The buggy address belongs to the physical page: page:ffffea0001df8380 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077e0ea00 pfn:0x77e0e head:ffffea0001df8380 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff888023353a01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012842c80 raw: ffff888077e0ea00 000000008010000f 00000001ffffffff ffff888023353a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3640, tgid 3640 (syz-executor), ts 75585604917, free_ts 75485365390 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:582 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:709 [inline] kvzalloc include/linux/slab.h:717 [inline] allocate_hook_entries_size net/netfilter/core.c:61 [inline] nf_hook_entries_grow+0x331/0x760 net/netfilter/core.c:128 __nf_register_net_hook+0x29c/0x930 net/netfilter/core.c:423 nf_register_net_hook+0xac/0x180 net/netfilter/core.c:566 nf_register_net_hooks+0x3d/0x1a0 net/netfilter/core.c:582 ipt_register_table+0x4ca/0x7a0 net/ipv4/netfilter/ip_tables.c:1783 iptable_security_table_init+0x3e/0x60 net/ipv4/netfilter/iptable_security.c:46 xt_find_table_lock+0x2cc/0x3a0 net/netfilter/x_tables.c:1259 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443 __alloc_skb+0xde/0x670 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1271 [inline] alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6168 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2747 sock_alloc_send_skb include/net/sock.h:1918 [inline] mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748 add_grhead net/ipv6/mcast.c:1851 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989 mld_send_initial_cr+0x20f/0x3a0 net/ipv6/mcast.c:2236 mld_dad_work+0x40/0x400 net/ipv6/mcast.c:2262 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 Memory state around the buggy address: ffff888077e0ed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077e0ed80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888077e0ee00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077e0ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077e0ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================