================================================================== BUG: KASAN: use-after-free in dev_map_enqueue+0x3d/0x340 kernel/bpf/devmap.c:532 Read of size 8 at addr ffff888063774600 by task syz.1.6122/22299 CPU: 1 PID: 22299 Comm: syz.1.6122 Not tainted 6.1.135-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x220 mm/kasan/report.c:427 kasan_report+0x10b/0x140 mm/kasan/report.c:531 dev_map_enqueue+0x3d/0x340 kernel/bpf/devmap.c:532 __xdp_do_redirect_frame net/core/filter.c:4328 [inline] xdp_do_redirect_frame+0x30c/0x650 net/core/filter.c:4390 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0x8ee/0x1990 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x6f1/0xe50 net/bpf/test_run.c:1390 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3685 __sys_bpf+0x593/0x6d0 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+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f354ef8e969 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:00007f354fd2d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f354f1b6080 RCX: 00007f354ef8e969 RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a RBP: 00007f354f010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f354f1b6080 R15: 00007ffe9765b498 Allocated by task 21357: 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+0x8e/0xa0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] get_undo_list ipc/sem.c:1856 [inline] copy_semundo+0xb2/0x230 ipc/sem.c:2314 copy_process+0x17d3/0x4060 kernel/fork.c:2251 kernel_clone+0x225/0x8b0 kernel/fork.c:2681 __do_sys_clone3 kernel/fork.c:2980 [inline] __se_sys_clone3+0x2dc/0x360 kernel/fork.c:2964 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14b/0x970 kernel/rcu/tree.c:2845 nf_unregister_net_hook net/netfilter/core.c:-1 [inline] nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601 nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:560 [inline] nf_ct_netns_put+0x2ce/0x510 net/netfilter/nf_conntrack_proto.c:641 nf_conncount_destroy+0x3d/0x150 net/netfilter/nf_conncount.c:592 ovs_ct_limit_exit net/openvswitch/conntrack.c:1919 [inline] ovs_ct_exit+0x98/0x200 net/openvswitch/conntrack.c:2322 ovs_exit_net+0xe1/0x790 net/openvswitch/datapath.c:2655 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x6f0/0xb80 net/core/net_namespace.c:640 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888063774600 which belongs to the cache kmalloc-cg-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff888063774600, ffff888063774660) The buggy address belongs to the physical page: page:ffffea00018ddd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888063774700 pfn:0x63774 memcg:ffff888029438401 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff8880174428c0 raw: ffff888063774700 0000000080200000 00000001ffffffff ffff888029438401 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 18211, tgid 18211 (syz.8.4734), ts 902519670039, free_ts 901878915312 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] get_undo_list ipc/sem.c:1856 [inline] copy_semundo+0xb2/0x230 ipc/sem.c:2314 copy_process+0x17d3/0x4060 kernel/fork.c:2251 kernel_clone+0x225/0x8b0 kernel/fork.c:2681 __do_sys_clone3 kernel/fork.c:2980 [inline] __se_sys_clone3+0x2dc/0x360 kernel/fork.c:2964 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 skb_free_frag include/linux/skbuff.h:3241 [inline] skb_free_head net/core/skbuff.c:760 [inline] skb_release_data+0x646/0x7c0 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x163/0x370 net/core/skbuff.c:893 kfree_skb include/linux/skbuff.h:1220 [inline] skb_queue_purge+0x134/0x1b0 net/core/skbuff.c:3460 packet_release+0xa85/0xc00 net/packet/af_packet.c:3228 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1400 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888063774500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888063774580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888063774600: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888063774680: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888063774700: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================