================================================================== BUG: KASAN: use-after-free in do_shrink_slab+0xb15/0xbd0 mm/vmscan.c:774 Read of size 8 at addr ffff8880259205b8 by task syz-fuzzer/3688 CPU: 3 PID: 3688 Comm: syz-fuzzer Not tainted 6.0.0-syzkaller-06162-g18fd049731e6 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 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:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 do_shrink_slab+0xb15/0xbd0 mm/vmscan.c:774 shrink_slab+0x17c/0x6f0 mm/vmscan.c:991 shrink_node_memcgs mm/vmscan.c:3182 [inline] shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304 shrink_zones mm/vmscan.c:3542 [inline] do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:3601 try_to_free_pages+0x2a7/0x840 mm/vmscan.c:3836 __perform_reclaim mm/page_alloc.c:4750 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline] __alloc_pages_slowpath.constprop.0+0x88a/0x2300 mm/page_alloc.c:5177 __alloc_pages+0x43d/0x510 mm/page_alloc.c:5562 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 folio_alloc+0x1c/0x70 mm/mempolicy.c:2280 filemap_alloc_folio+0x306/0x3a0 mm/filemap.c:970 page_cache_ra_unbounded+0x1af/0x550 mm/readahead.c:242 do_page_cache_ra mm/readahead.c:293 [inline] page_cache_ra_order+0x67a/0x980 mm/readahead.c:550 do_sync_mmap_readahead mm/filemap.c:3028 [inline] filemap_fault+0x1641/0x2610 mm/filemap.c:3120 __do_fault+0x10d/0x610 mm/memory.c:4173 do_read_fault mm/memory.c:4524 [inline] do_fault mm/memory.c:4653 [inline] handle_pte_fault mm/memory.c:4917 [inline] __handle_mm_fault+0x2130/0x39b0 mm/memory.c:5059 handle_mm_fault+0x1c8/0x780 mm/memory.c:5157 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1407 handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x451cf7 Code: 00 00 00 48 89 c6 48 29 d0 48 89 c2 48 c1 e8 0c 48 8d 3c 80 48 c1 e7 02 48 03 b9 98 00 00 00 48 81 e2 ff 0f 00 00 48 c1 ea 08 <44> 8b 07 66 0f 1f 44 00 00 48 83 fa 10 0f 83 0b 01 00 00 0f b6 54 RSP: 002b:000000c00010b858 EFLAGS: 00010202 RAX: 000000000000000c RBX: 000000000040d174 RCX: 000000000116b280 RDX: 0000000000000001 RSI: 000000000040d174 RDI: 0000000000cf6190 RBP: 000000c00010b868 R08: 0000000001f33640 R09: 0000000000000001 R10: 000000c0263c2050 R11: 00000000c978baaa R12: 000000c00010b9a0 R13: 0000000000000000 R14: 000000c000102000 R15: 00007fe7a1a1ebe7 Allocated by task 4305: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] __do_kmalloc mm/slab.c:3686 [inline] __kmalloc+0x1f9/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:124 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 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 4305: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x13d/0x1a0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3418 [inline] kfree+0x173/0x390 mm/slab.c:3786 ops_init+0xcd/0x470 net/core/net_namespace.c:139 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 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 ffff888025920000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1464 bytes inside of 2048-byte region [ffff888025920000, ffff888025920800) The buggy address belongs to the physical page: page:ffffea0000964800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25920 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000a1adc8 ffffea00008d3e88 ffff888011840800 raw: 0000000000000000 ffff888025920000 0000000100000001 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 0x2d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_THISNODE), pid 3726, tgid 3726 (syz-executor.2), ts 234029793455, free_ts 233691880714 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages_slowpath.constprop.0+0x34d/0x2300 mm/page_alloc.c:5084 __alloc_pages+0x43d/0x510 mm/page_alloc.c:5562 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] slab_alloc_node mm/slab.c:3220 [inline] kmem_cache_alloc_node_trace+0x50a/0x570 mm/slab.c:3601 __do_kmalloc_node mm/slab.c:3623 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3638 kmalloc_reserve net/core/skbuff.c:437 [inline] pskb_expand_head+0x203/0x1110 net/core/skbuff.c:1832 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] rtnetlink_event+0x193/0x1d0 net/core/rtnetlink.c:6142 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 __netdev_upper_dev_link+0x3fd/0x7f0 net/core/dev.c:7651 netdev_master_upper_dev_link+0x98/0xd0 net/core/dev.c:7721 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 slab_destroy mm/slab.c:1615 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1635 cache_flusharray mm/slab.c:3389 [inline] ___cache_free+0x2a8/0x3d0 mm/slab.c:3452 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc mm/slab.c:3294 [inline] kmem_cache_alloc_trace+0x212/0x460 mm/slab.c:3557 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] kobject_uevent_env+0x230/0x1640 lib/kobject_uevent.c:524 __kobject_del+0x160/0x1f0 lib/kobject.c:585 kobject_cleanup lib/kobject.c:664 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2ed/0x4c0 lib/kobject.c:721 net_rx_queue_update_kobjects+0x3f3/0x510 net/core/net-sysfs.c:1128 netif_set_real_num_rx_queues+0x161/0x200 net/core/dev.c:2941 veth_init_queues drivers/net/veth.c:1692 [inline] veth_init_queues+0x14d/0x190 drivers/net/veth.c:1682 veth_newlink+0x679/0x990 drivers/net/veth.c:1813 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3581 Memory state around the buggy address: ffff888025920480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025920500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888025920580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025920600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025920680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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