================================================================== BUG: KASAN: slab-use-after-free in defer_free+0x3c/0xbc mm/slub.c:6537 Write at addr f4f000000bbe6960 by task syz.1.213/3975 Pointer tag: [f4], memory tag: [fe] CPU: 0 UID: 0 PID: 3975 Comm: syz.1.213 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) 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_clear+0x24c/0x6a8 kernel/bpf/range_tree.c:172 arena_vm_fault+0xf0/0x1a8 kernel/bpf/arena.c:285 __do_fault+0x3c/0x234 mm/memory.c:5320 do_shared_fault mm/memory.c:5819 [inline] do_fault+0xb8/0x680 mm/memory.c:5893 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 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1e0/0xcb4 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x35c/0x724 mm/gup.c:2476 pin_user_pages_remote+0x80/0xa8 mm/gup.c:3363 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline] process_vm_rw_core.constprop.0+0x190/0x3f0 mm/process_vm_access.c:216 process_vm_rw+0x140/0x164 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __arm64_sys_process_vm_writev+0x28/0x34 mm/process_vm_access.c:299 __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 Allocated by task 3975: 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_shared_fault mm/memory.c:5819 [inline] do_fault+0xb8/0x680 mm/memory.c:5893 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 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1e0/0xcb4 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x35c/0x724 mm/gup.c:2476 pin_user_pages_remote+0x80/0xa8 mm/gup.c:3363 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline] process_vm_rw_core.constprop.0+0x190/0x3f0 mm/process_vm_access.c:216 process_vm_rw+0x140/0x164 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __arm64_sys_process_vm_writev+0x28/0x34 mm/process_vm_access.c:299 __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 3975: 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_clear+0x24c/0x6a8 kernel/bpf/range_tree.c:172 arena_vm_fault+0xf0/0x1a8 kernel/bpf/arena.c:285 __do_fault+0x3c/0x234 mm/memory.c:5320 do_shared_fault mm/memory.c:5819 [inline] do_fault+0xb8/0x680 mm/memory.c:5893 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 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1e0/0xcb4 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x35c/0x724 mm/gup.c:2476 pin_user_pages_remote+0x80/0xa8 mm/gup.c:3363 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline] process_vm_rw_core.constprop.0+0x190/0x3f0 mm/process_vm_access.c:216 process_vm_rw+0x140/0x164 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __arm64_sys_process_vm_writev+0x28/0x34 mm/process_vm_access.c:299 __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 The buggy address belongs to the object at fff000000bbe6940 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 32 bytes inside of 64-byte region [fff000000bbe6940, fff000000bbe6980) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xf9f000000bbe6800 pfn:0x4bbe6 flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) page_type: f5(slab) raw: 01ffc00000000000 f9f0000003001600 dead000000000122 0000000000000000 raw: f9f000000bbe6800 0000000080400030 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff000000bbe6700: fa fa fa fa fe fe fe fe fe fe fe fe fe fe fe fe fff000000bbe6800: fe fe fe fe fc fc fc fe f5 f5 f5 f5 f3 f3 f3 f3 >fff000000bbe6900: fd fd fd fd fe fe fe fe fe fe fe fe f5 f5 f5 fe ^ fff000000bbe6a00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff000000bbe6b00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ==================================================================