================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf8011063e50 by task syz-executor.1/2058 CPU: 0 PID: 2058 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 [] check_prev_add kernel/locking/lockdep.c:3063 [inline] [] check_prevs_add kernel/locking/lockdep.c:3186 [inline] [] validate_chain kernel/locking/lockdep.c:3801 [inline] [] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 Allocated by task 2059: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x8e/0x98 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] __kernfs_new_node+0xfc/0x5f2 fs/kernfs/dir.c:585 kernfs_new_node+0x66/0xbe fs/kernfs/dir.c:647 __kernfs_create_file+0x4e/0x1e8 fs/kernfs/file.c:987 sysfs_add_file_mode_ns+0x138/0x254 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x274/0x722 fs/sysfs/group.c:148 internal_create_groups.part.0+0x64/0xe8 fs/sysfs/group.c:188 internal_create_groups fs/sysfs/group.c:184 [inline] sysfs_create_groups+0x2c/0x48 fs/sysfs/group.c:214 device_add_groups drivers/base/core.c:2471 [inline] device_add_attrs drivers/base/core.c:2619 [inline] device_add+0x656/0x129e drivers/base/core.c:3356 netdev_register_kobject+0xcc/0x208 net/core/net-sysfs.c:2008 register_netdevice+0x8ee/0xc6a net/core/dev.c:9667 veth_newlink+0x454/0x7dc drivers/net/veth.c:1722 __rtnl_newlink+0xc16/0xfa0 net/core/rtnetlink.c:3479 rtnl_newlink+0x60/0x8c net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x338/0x9a0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0xf8/0x2be net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:5610 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x40e/0x5fe net/netlink/af_netlink.c:1343 netlink_sendmsg+0x4e0/0x994 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xa0/0xc4 net/socket.c:725 __sys_sendto+0x1f2/0x2e0 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] sys_sendto+0x3e/0x52 net/socket.c:2048 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ffffaf8011063d98 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 16 bytes to the right of 168-byte region [ffffaf8011063d98, ffffaf8011063e40) The buggy address belongs to the page: page:ffffaf807ab12bd8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x91263 flags: 0x9000000200(slab|section=18|node=0|zone=0) raw: 0000009000000200 0000000000000000 0000000000000122 ffffaf80072ed280 raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2059, ts 1040320996800, free_ts 1040280503100 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x76/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x39c/0x3de mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] __kernfs_new_node+0xfc/0x5f2 fs/kernfs/dir.c:585 kernfs_new_node+0x66/0xbe fs/kernfs/dir.c:647 __kernfs_create_file+0x4e/0x1e8 fs/kernfs/file.c:987 sysfs_add_file_mode_ns+0x138/0x254 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x274/0x722 fs/sysfs/group.c:148 internal_create_groups.part.0+0x64/0xe8 fs/sysfs/group.c:188 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 free_pages.part.0+0xe0/0xf6 mm/page_alloc.c:5485 free_pages+0xe/0x18 mm/page_alloc.c:5482 pgd_free include/asm-generic/pgalloc.h:193 [inline] mm_free_pgd kernel/fork.c:650 [inline] __mmdrop+0x86/0x2ac kernel/fork.c:701 mmdrop include/linux/sched/mm.h:49 [inline] __mmput kernel/fork.c:1124 [inline] mmput+0x2a2/0x2c2 kernel/fork.c:1135 free_bprm+0xbc/0x1de fs/exec.c:1485 kernel_execve+0x214/0x288 fs/exec.c:1982 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 Memory state around the buggy address: ffffaf8011063d00: f1 f1 f1 f1 00 f3 f3 f3 00 00 00 fc fc fc fc fc ffffaf8011063d80: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffaf8011063e00: f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc 00 00 00 f3 ^ ffffaf8011063e80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf8011063f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================