syz-executor.2: attempt to access beyond end of device loop2: rw=0, sector=53248, nr_sectors = 8 limit=40427 ================================================================== BUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 Read of size 8 at addr ffff8880468b7680 by task syz-executor.2/5876 CPU: 1 PID: 5876 Comm: syz-executor.2 Not tainted 6.8.0-rc3-syzkaller-00047-g047371968ffc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 __do_fault+0x135/0x460 mm/memory.c:4376 do_read_fault mm/memory.c:4738 [inline] do_fault mm/memory.c:4868 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5144 [inline] __handle_mm_fault+0x49e6/0x72d0 mm/memory.c:5285 handle_mm_fault+0x27e/0x770 mm/memory.c:5450 faultin_page mm/gup.c:958 [inline] __get_user_pages+0x6bd/0x1600 mm/gup.c:1241 populate_vma_page_range+0x2aa/0x380 mm/gup.c:1679 __mm_populate+0x279/0x460 mm/gup.c:1788 mm_populate include/linux/mm.h:3391 [inline] vm_mmap_pgoff+0x304/0x420 mm/util.c:561 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f244107dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2441e020c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f24411ac050 RCX: 00007f244107dda9 RDX: 00000000027fffff RSI: 0000000000600000 RDI: 0000000020000000 RBP: 00007f24410ca47a R08: 0000000000000007 R09: 0000000000000000 R10: 0000000004002011 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f24411ac050 R15: 00007ffe2be517c8 Allocated by task 5876: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:314 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 vm_area_alloc+0x24/0x1d0 kernel/fork.c:465 mmap_region+0xbd8/0x1fa0 mm/mmap.c:2806 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 5877: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x102/0x2a0 mm/slub.c:4363 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465 __do_softirq+0x2bb/0x942 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xae/0x100 mm/kasan/generic.c:586 __call_rcu_common kernel/rcu/tree.c:2715 [inline] call_rcu+0x167/0xa80 kernel/rcu/tree.c:2829 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2285 [inline] do_vmi_align_munmap+0x15a7/0x1930 mm/mmap.c:2631 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2695 mmap_region+0x677/0x1fa0 mm/mmap.c:2746 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff8880468b7660 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff8880468b7660, ffff8880468b7720) The buggy address belongs to the physical page: page:ffffea00011a2dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x468b7 memcg:ffff888024310701 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8880162aab40 ffffea0000778580 dead000000000002 raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff888024310701 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 25084, tgid 25084 (udevadm), ts 1174397402792, free_ts 1174396231845 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x24d/0x340 mm/slub.c:3867 vm_area_dup+0x27/0x290 kernel/fork.c:480 __split_vma+0x1a9/0xd00 mm/mmap.c:2335 do_vmi_align_munmap+0x451/0x1930 mm/mmap.c:2549 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2695 mmap_region+0x677/0x1fa0 mm/mmap.c:2746 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 page last free pid 25076 tgid 25075 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346 free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532 release_pages+0x2117/0x2400 mm/swap.c:1042 __folio_batch_release+0x84/0x100 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] truncate_inode_pages_range+0x457/0xf70 mm/truncate.c:362 f2fs_recover_fsync_data+0x6e2e/0x77f0 fs/f2fs/recovery.c:904 f2fs_fill_super+0x7142/0x8050 fs/f2fs/super.c:4724 mount_bdev+0x20a/0x2d0 fs/super.c:1663 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff8880468b7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880468b7600: 00 00 fc fc fc fc fc fc fc fc fc fc fa fb fb fb >ffff8880468b7680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880468b7700: fb fb fb fb fc fc fc fc fc fc fc fc fc fc 00 00 ffff8880468b7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================