================================================================== BUG: KASAN: slab-use-after-free in defer_free+0x3c/0xbc mm/slub.c:6537 Write at addr f1f000000b4283e0 by task kworker/u8:6/1096 Pointer tag: [f1], memory tag: [fe] CPU: 1 UID: 0 PID: 1096 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events_unbound bpf_map_free_deferred Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x108/0x61c mm/kasan/report.c:482 kasan_report+0x88/0xac mm/kasan/report.c:595 report_tag_fault arch/arm64/mm/fault.c:330 [inline] do_tag_recovery arch/arm64/mm/fault.c:342 [inline] __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:384 do_bad_area+0x68/0x78 arch/arm64/mm/fault.c:484 do_tag_check_fault+0x34/0x44 arch/arm64/mm/fault.c:857 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:933 el1_abort+0x44/0x68 arch/arm64/kernel/entry-common.c:303 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:437 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591 defer_free+0x3c/0xbc mm/slub.c:6537 (P) do_slab_free mm/slub.c:6619 [inline] kfree_nolock+0x1a0/0x1d4 mm/slub.c:6930 range_tree_destroy+0x74/0x90 kernel/bpf/range_tree.c:253 arena_map_free+0x64/0x90 kernel/bpf/arena.c:196 bpf_map_free kernel/bpf/syscall.c:894 [inline] bpf_map_free_deferred+0x70/0x180 kernel/bpf/syscall.c:921 process_one_work+0x178/0x2cc kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x24c/0x354 kernel/workqueue.c:3421 kthread+0x130/0x1fc kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 3529: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:56 save_stack_info+0x40/0x158 mm/kasan/tags.c:106 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:142 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xb4/0xb8 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] kmalloc_nolock_noprof+0x1dc/0x4fc mm/slub.c:5751 range_tree_clear+0x3a4/0x6a8 kernel/bpf/range_tree.c:152 arena_vm_fault+0xf0/0x1a8 kernel/bpf/arena.c:285 __do_fault+0x3c/0x234 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault+0x314/0x680 mm/memory.c:5889 do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault+0x440/0xc2c mm/memory.c:6411 handle_mm_fault+0x15c/0x30c mm/memory.c:6580 do_page_fault+0x194/0x680 arch/arm64/mm/fault.c:700 do_translation_fault+0x60/0x6c arch/arm64/mm/fault.c:793 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:933 el1_abort+0x44/0x68 arch/arm64/kernel/entry-common.c:303 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:437 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0xcc/0x1a0 lib/strncpy_from_user.c:149 getname_flags.part.0+0x48/0x1c0 fs/namei.c:157 getname_flags+0x38/0x60 include/linux/audit.h:345 getname include/linux/fs.h:2498 [inline] do_sys_openat2+0x5c/0x108 fs/open.c:1426 __do_sys_openat2 fs/open.c:1479 [inline] __se_sys_openat2 fs/open.c:1455 [inline] __arm64_sys_openat2+0x100/0x17c fs/open.c:1455 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0x128 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 Freed by task 1096: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:56 save_stack_info+0x40/0x158 mm/kasan/tags.c:106 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x7c/0x8c mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] kfree_nolock+0xcc/0x1d4 mm/slub.c:6929 range_tree_destroy+0x74/0x90 kernel/bpf/range_tree.c:253 arena_map_free+0x64/0x90 kernel/bpf/arena.c:196 bpf_map_free kernel/bpf/syscall.c:894 [inline] bpf_map_free_deferred+0x70/0x180 kernel/bpf/syscall.c:921 process_one_work+0x178/0x2cc kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x24c/0x354 kernel/workqueue.c:3421 kthread+0x130/0x1fc kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at fff000000b4283c0 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 32 bytes inside of 64-byte region [fff000000b4283c0, fff000000b428400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xf1f000000b4284c0 pfn:0x4b428 flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) page_type: f5(slab) raw: 01ffc00000000000 f9f0000003001600 dead000000000122 0000000000000000 raw: f1f000000b4284c0 000000008040003f 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff000000b428100: fd fd fd fe f8 f8 f8 fe f2 f2 f2 fe f5 f5 f5 fe fff000000b428200: fb fb fb fe f6 f6 f6 fe f2 f2 f2 fe f4 f4 f4 f4 >fff000000b428300: f4 f4 f4 fe fa fa fa fe f0 f0 f0 fe fe fe fe fe ^ fff000000b428400: f6 f6 f6 f6 fe fe fe fe fe fe fe fe fe fe fe fe fff000000b428500: fb fb fb fe f5 f5 f5 fe f5 f5 f5 f5 fc fc fc fc ==================================================================