================================================================== BUG: KASAN: use-after-free in __ext4_iget+0x2ee/0x3f00 fs/ext4/inode.c:4682 Read of size 8 at addr ffff888134bcf008 by task syz-executor.0/18545 CPU: 1 PID: 18545 Comm: syz-executor.0 Not tainted 5.15.118-syzkaller-01748-g241da2ad5601 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 __ext4_iget+0x2ee/0x3f00 fs/ext4/inode.c:4682 ext4_quota_enable fs/ext4/super.c:6363 [inline] ext4_enable_quotas+0x556/0x980 fs/ext4/super.c:6399 ext4_fill_super+0x8b32/0x9680 fs/ext4/super.c:4950 mount_bdev+0x282/0x3b0 fs/super.c:1378 ext4_mount+0x34/0x40 fs/ext4/super.c:6578 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1508 do_new_mount+0x28b/0xad0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f7fdfcfd8ba Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7fdea6ef88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000000004a6 RCX: 00007f7fdfcfd8ba RDX: 00000000200004c0 RSI: 0000000020000500 RDI: 00007f7fdea6efe0 RBP: 00007f7fdea6f020 R08: 00007f7fdea6f020 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200004c0 R13: 0000000020000500 R14: 00007f7fdea6efe0 R15: 0000000020001f40 Allocated by task 17919: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3238 [inline] slab_alloc mm/slub.c:3246 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3251 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2776 [inline] f2fs_alloc_inode+0x26/0x3f0 fs/f2fs/super.c:1373 alloc_inode fs/inode.c:236 [inline] iget_locked+0x174/0x860 fs/inode.c:1202 f2fs_iget+0x55/0x4df0 fs/f2fs/inode.c:489 f2fs_fill_super+0x66d0/0x81a0 fs/f2fs/super.c:4299 mount_bdev+0x282/0x3b0 fs/super.c:1378 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4546 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1508 do_new_mount+0x28b/0xad0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 destroy_inode fs/inode.c:291 [inline] evict+0x5df/0x630 fs/inode.c:602 iput_final fs/inode.c:1663 [inline] iput+0x63b/0x7e0 fs/inode.c:1689 f2fs_put_super+0x632/0xc10 fs/f2fs/super.c:1609 generic_shutdown_super+0x157/0x2e0 fs/super.c:475 kill_block_super+0x7e/0xe0 fs/super.c:1405 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4578 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 destroy_inode fs/inode.c:291 [inline] evict+0x5df/0x630 fs/inode.c:602 dispose_list fs/inode.c:620 [inline] evict_inodes+0x5db/0x660 fs/inode.c:670 generic_shutdown_super+0x9c/0x2e0 fs/super.c:454 kill_block_super+0x7e/0xe0 fs/super.c:1405 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4578 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888134bceac8 which belongs to the cache f2fs_inode_cache of size 1480 The buggy address is located 1344 bytes inside of 1480-byte region [ffff888134bceac8, ffff888134bcf090) The buggy address belongs to the page: page:ffffea0004d2f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888134bceac8 pfn:0x134bc8 head:ffffea0004d2f200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004e41c00 0000000600000006 ffff888103fd6000 raw: ffff888134bceac8 0000000080140005 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 7937, ts 1046640400503, free_ts 1031640652146 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2595 prep_new_page mm/page_alloc.c:2601 [inline] get_page_from_freelist+0x2eab/0x2f80 mm/page_alloc.c:4394 __alloc_pages+0x386/0x7b0 mm/page_alloc.c:5679 allocate_slab mm/slub.c:1930 [inline] new_slab+0x92/0x490 mm/slub.c:1993 ___slab_alloc+0x39e/0x830 mm/slub.c:3026 __slab_alloc+0x4a/0x90 mm/slub.c:3113 slab_alloc_node mm/slub.c:3204 [inline] slab_alloc mm/slub.c:3246 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3251 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2776 [inline] f2fs_alloc_inode+0x26/0x3f0 fs/f2fs/super.c:1373 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:937 new_inode+0x28/0x1c0 fs/inode.c:966 f2fs_new_inode+0x10e/0x1410 fs/f2fs/namei.c:36 f2fs_symlink+0x262/0x8e0 fs/f2fs/namei.c:695 vfs_symlink+0x29f/0x480 fs/namei.c:4358 ovl_do_symlink fs/overlayfs/overlayfs.h:179 [inline] ovl_create_real+0x202/0x3c0 fs/overlayfs/dir.c:204 ovl_create_temp+0x4e/0x60 fs/overlayfs/dir.c:228 ovl_copy_up_workdir fs/overlayfs/copy_up.c:680 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:824 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:998 [inline] ovl_copy_up_flags+0x1e9b/0x2cd0 fs/overlayfs/copy_up.c:1044 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1466 [inline] free_pcp_prepare mm/page_alloc.c:1538 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3502 free_unref_page+0xbd/0x5a0 mm/page_alloc.c:3583 free_the_page mm/page_alloc.c:800 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5755 __free_slab+0xec/0x1d0 mm/slub.c:2018 free_slab mm/slub.c:2033 [inline] discard_slab+0x29/0x40 mm/slub.c:2039 __slab_free+0x205/0x290 mm/slub.c:3422 do_slab_free mm/slub.c:3505 [inline] ___cache_free+0x109/0x120 mm/slub.c:3524 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3238 [inline] slab_alloc mm/slub.c:3246 [inline] __kmalloc+0x11e/0x270 mm/slub.c:4421 kmalloc_array include/linux/slab.h:648 [inline] kcalloc include/linux/slab.h:677 [inline] ext4_find_extent+0x370/0xdb0 fs/ext4/extents.c:907 ext4_ext_map_blocks+0x254/0x7250 fs/ext4/extents.c:4103 ext4_map_blocks+0x41d/0x1e30 fs/ext4/inode.c:571 Memory state around the buggy address: ffff888134bcef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888134bcef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888134bcf000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888134bcf080: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888134bcf100: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop0): ext4_enable_quotas:6407: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop0): mount failed