================================================================== BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 Read of size 8 at addr ffff888051184400 by task syz.3.5655/23488 CPU: 0 UID: 0 PID: 23488 Comm: syz.3.5655 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add_tail include/linux/list.h:183 [inline] disk_add_events+0x90/0x170 block/disk-events.c:463 add_disk_final block/genhd.c:427 [inline] add_disk_fwnode+0x3c8/0x5d0 block/genhd.c:610 add_disk include/linux/blkdev.h:773 [inline] md_alloc+0x3c2/0x1080 drivers/md/md.c:5981 md_alloc_and_put drivers/md/md.c:6016 [inline] md_probe drivers/md/md.c:6029 [inline] md_probe+0x6e/0xd0 drivers/md/md.c:6024 blk_probe_dev+0x116/0x1a0 block/genhd.c:884 blk_request_module+0x16/0xb0 block/genhd.c:897 blkdev_get_no_open+0x9b/0x100 block/bdev.c:825 blkdev_open+0x141/0x3f0 block/fops.c:684 do_dentry_open+0x744/0x1c10 fs/open.c:965 vfs_open+0x82/0x3f0 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f43ab58e9a9 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:00007f43ac403038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f43ab7b6080 RCX: 00007f43ab58e9a9 RDX: 0000000000000000 RSI: 0000200000000a80 RDI: ffffffffffffff9c RBP: 00007f43ab610d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f43ab7b6080 R15: 00007ffddfab60a8 Allocated by task 23476: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] disk_alloc_events+0xf0/0x3f0 block/disk-events.c:439 __add_disk+0x475/0xf00 block/genhd.c:500 add_disk_fwnode+0x3f8/0x5d0 block/genhd.c:601 add_disk include/linux/blkdev.h:773 [inline] md_alloc+0x3c2/0x1080 drivers/md/md.c:5981 md_alloc_and_put drivers/md/md.c:6016 [inline] md_probe drivers/md/md.c:6029 [inline] md_probe+0x6e/0xd0 drivers/md/md.c:6024 blk_probe_dev+0x116/0x1a0 block/genhd.c:884 blk_request_module+0x16/0xb0 block/genhd.c:897 blkdev_get_no_open+0x9b/0x100 block/bdev.c:825 blkdev_open+0x141/0x3f0 block/fops.c:684 do_dentry_open+0x744/0x1c10 fs/open.c:965 vfs_open+0x82/0x3f0 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23470: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4842 disk_release+0x161/0x410 block/genhd.c:1301 device_release+0xa1/0x240 drivers/base/core.c:2568 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e7/0x5a0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3800 blkdev_release+0x15/0x20 block/fops.c:699 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888051184400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of freed 512-byte region [ffff888051184400, ffff888051184600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888051187800 pfn:0x51184 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b842c80 ffffea0000ae4510 ffffea000142c010 raw: ffff888051187800 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b842c80 ffffea0000ae4510 ffffea000142c010 head: ffff888051187800 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001446101 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6032, tgid 6032 (syz-executor), ts 226249617950, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x23b/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kmalloc_array_noprof include/linux/slab.h:948 [inline] cache_create_net+0x9d/0x220 net/sunrpc/cache.c:1747 rsi_cache_create_net net/sunrpc/auth_gss/svcauth_gss.c:2024 [inline] gss_svc_init_net+0x122/0x660 net/sunrpc/auth_gss/svcauth_gss.c:2084 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138 setup_net+0x1ff/0x510 net/core/net_namespace.c:442 copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:574 create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218 ksys_unshare+0x45b/0xa40 kernel/fork.c:3121 page_owner free stack trace missing Memory state around the buggy address: ffff888051184300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888051184380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888051184400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888051184480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888051184500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================