================================================================== BUG: KASAN: use-after-free in ocfs2_fault+0xc8/0x4a4 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000d43d1808 by task syz.4.5/4452 CPU: 1 PID: 4452 Comm: syz.4.5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 ocfs2_fault+0xc8/0x4a4 fs/ocfs2/mmap.c:41 __do_fault+0x11c/0x3d8 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1ac0/0x2ff0 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x338/0x798 mm/gup.c:1250 __get_user_pages_locked mm/gup.c:1454 [inline] get_user_pages_unlocked+0x1bc/0x658 mm/gup.c:2371 __gup_longterm_unlocked mm/gup.c:2982 [inline] internal_get_user_pages_fast+0x1728/0x1a70 mm/gup.c:3072 get_user_pages_fast+0x60/0x94 mm/gup.c:3164 __iov_iter_get_pages_alloc+0x2e0/0x800 lib/iov_iter.c:1460 iov_iter_get_pages2+0x74/0xbc lib/iov_iter.c:1503 dio_refill_pages fs/direct-io.c:172 [inline] dio_get_page fs/direct-io.c:215 [inline] do_direct_IO fs/direct-io.c:926 [inline] __blockdev_direct_IO+0xc74/0x318c fs/direct-io.c:1260 ocfs2_direct_IO+0x208/0x280 fs/ocfs2/aops.c:2468 generic_file_direct_write+0x104/0x2b8 mm/filemap.c:3787 __generic_file_write_iter+0x144/0x250 mm/filemap.c:3945 ocfs2_file_write_iter+0x1300/0x1bf4 fs/ocfs2/file.c:2469 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 4452: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x43c mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x234/0x318 mm/slub.c:3383 vm_area_alloc+0x2c/0xe0 kernel/fork.c:459 __mmap_region mm/mmap.c:2753 [inline] mmap_region+0xb68/0x18d8 mm/mmap.c:2916 do_mmap+0x9dc/0x11f4 mm/mmap.c:1436 vm_mmap_pgoff+0x184/0x284 mm/util.c:520 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4490: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free+0x11c/0x324 mm/slub.c:3709 vm_area_free+0x58/0x12c kernel/fork.c:486 remove_vma mm/mmap.c:144 [inline] remove_mt mm/mmap.c:2319 [inline] do_mas_align_munmap+0xc1c/0xeec mm/mmap.c:2595 do_mas_munmap mm/mmap.c:2650 [inline] __mmap_region mm/mmap.c:2698 [inline] mmap_region+0x660/0x18d8 mm/mmap.c:2916 do_mmap+0x9dc/0x11f4 mm/mmap.c:1436 vm_mmap_pgoff+0x184/0x284 mm/util.c:520 ksys_mmap_pgoff+0xd0/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000d43d1798 which belongs to the cache vm_area_struct of size 152 The buggy address is located 112 bytes inside of 152-byte region [ffff0000d43d1798, ffff0000d43d1830) The buggy address belongs to the physical page: page:00000000c35cf5db refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1143d1 memcg:ffff0000df139001 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc000355a600 dead000000000008 ffff0000c03db680 raw: 0000000000000000 0000000000120012 00000001ffffffff ffff0000df139001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d43d1700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff0000d43d1780: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d43d1800: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb ^ ffff0000d43d1880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d43d1900: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ================================================================== (syz.4.5,4452,0):ocfs2_dio_end_io:2428 ERROR: Direct IO failed, bytes = -5