================================================================== BUG: KASAN: use-after-free in __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 Read of size 8 at addr ffff88806f1ca5c8 by task syz-executor.4/3989 CPU: 1 PID: 3989 Comm: syz-executor.4 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] register_shrinker_prepared mm/vmscan.c:695 [inline] __register_shrinker mm/vmscan.c:707 [inline] register_shrinker+0x6f/0x160 mm/vmscan.c:733 nfsd4_init_leases_net+0x390/0x490 fs/nfsd/nfs4state.c:4390 nfsd_init_net+0x1b5/0x430 fs/nfsd/nfsctl.c:1456 ops_init+0xaf/0x470 net/core/net_namespace.c:135 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f778ac8a669 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f778bd3b038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f778adac050 RCX: 00007f778ac8a669 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00007f778bd3b050 RBP: 00007f778ace5560 R08: 0000000000000000 R09: 0000000000000058 R10: 00007f778bd3b050 R11: 0000000000000246 R12: 0000000000000058 R13: 00007ffdfc83f83f R14: 00007f778bd3b300 R15: 0000000000022000 Allocated by task 3997: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] kzalloc include/linux/slab.h:695 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:125 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 3997: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____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:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 ops_init+0xcd/0x470 net/core/net_namespace.c:140 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88806f1ca000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1480 bytes inside of 2048-byte region [ffff88806f1ca000, ffff88806f1ca800) The buggy address belongs to the physical page: page:ffffea0001bc7200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f1c8 head:ffffea0001bc7200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011842000 dead000000080008 0000000000000000 raw: 0000000000000000 dead000000000001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3719, tgid 3719 (syz-executor.2), ts 1609301556645, free_ts 12008621397 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 __do_kmalloc_node mm/slab_common.c:933 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:954 kmalloc_reserve net/core/skbuff.c:362 [inline] pskb_expand_head+0x203/0x1110 net/core/skbuff.c:1730 netlink_trim+0x1ea/0x240 net/netlink/af_netlink.c:1301 netlink_broadcast+0x5f/0xd90 net/netlink/af_netlink.c:1497 nlmsg_multicast include/net/netlink.h:1044 [inline] nlmsg_notify+0x8f/0x280 net/netlink/af_netlink.c:2583 rtnl_notify net/core/rtnetlink.c:767 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3929 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3944 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3932 [inline] rtmsg_ifinfo+0xf0/0x120 net/core/rtnetlink.c:3950 __dev_notify_flags+0x226/0x2b0 net/core/dev.c:8590 dev_change_flags+0x112/0x170 net/core/dev.c:8632 do_setlink+0x9f1/0x3bb0 net/core/rtnetlink.c:2788 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 free_contig_range+0xb1/0x180 mm/page_alloc.c:9468 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x2954/0x29e5 mm/debug_vm_pgtable.c:1354 do_one_initcall+0x13d/0x780 init/main.c:1307 do_initcall_level init/main.c:1382 [inline] do_initcalls init/main.c:1398 [inline] do_basic_setup init/main.c:1417 [inline] kernel_init_freeable+0x6ff/0x788 init/main.c:1637 kernel_init+0x1a/0x1d0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88806f1ca480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f1ca500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806f1ca580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f1ca600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f1ca680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================