================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800ce23f90 by task syz-executor.0/2037 CPU: 0 PID: 2037 Comm: syz-executor.0 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 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] save_stack+0x112/0x16c mm/page_owner.c:121 Allocated by task 794645: (stack is not available) Last potentially related work creation: 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_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] kmem_cache_alloc_trace+0x178/0x2e0 mm/slub.c:3257 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] call_usermodehelper_setup+0x88/0x1ac kernel/umh.c:365 kobject_uevent_env+0xa22/0xdfe lib/kobject_uevent.c:614 kobject_uevent+0x22/0x2e lib/kobject_uevent.c:642 kset_register+0xf8/0x114 lib/kobject.c:881 __class_register+0x17c/0x2da drivers/base/class.c:188 __class_create+0x90/0xd6 drivers/base/class.c:242 usb_roles_init+0x2e/0x6e drivers/usb/roles/class.c:393 do_one_initcall+0x13a/0x7ea init/main.c:1300 do_initcall_level init/main.c:1373 [inline] do_initcalls init/main.c:1389 [inline] do_basic_setup init/main.c:1408 [inline] kernel_init_freeable+0x510/0x5b4 init/main.c:1613 kernel_init+0x28/0x21c init/main.c:1502 ret_from_exception+0x0/0x10 The buggy address belongs to the object at ffffaf800ce23e80 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 104 bytes to the right of 168-byte region [ffffaf800ce23e80, ffffaf800ce23f28) The buggy address belongs to the page: page:ffffaf807a9e89d8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d023 flags: 0x8800000200(slab|section=17|node=0|zone=0) raw: 0000008800000200 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 2037, ts 696402186700, free_ts 696361352700 __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_list+0x148/0x7fe mm/page_alloc.c:3441 release_pages+0x3f0/0xad0 mm/swap.c:980 free_pages_and_swap_cache+0x74/0x86 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:243 [inline] tlb_flush_mmu mm/mmu_gather.c:250 [inline] tlb_finish_mmu+0xe8/0x29a mm/mmu_gather.c:341 exit_mmap+0x170/0x412 mm/mmap.c:3180 __mmput kernel/fork.c:1114 [inline] mmput+0xee/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: ffffaf800ce23e80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffffaf800ce23f00: 00 00 00 f3 f3 f3 f3 f3 fc fc fc fc fc fc fc fc >ffffaf800ce23f80: fc fc fc fc fc fc fc fc f1 f1 f1 f1 00 00 00 00 ^ ffffaf800ce24000: 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 ffffaf800ce24080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================