================================================================== BUG: KASAN: slab-out-of-bounds in __ext4_iget+0x2ee/0x3ef0 fs/ext4/inode.c:4683 Read of size 8 at addr ffff8881266c7ef8 by task syz.9.7563/28252 CPU: 0 PID: 28252 Comm: syz.9.7563 Not tainted 5.15.167-syzkaller-android13-5.15.167_r00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 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/0x3ef0 fs/ext4/inode.c:4683 ext4_quota_enable fs/ext4/super.c:6378 [inline] ext4_enable_quotas+0x556/0x980 fs/ext4/super.c:6414 ext4_fill_super+0x8b95/0x96e0 fs/ext4/super.c:4950 mount_bdev+0x282/0x3b0 fs/super.c:1398 ext4_mount+0x34/0x40 fs/ext4/super.c:6593 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611 vfs_get_tree+0x88/0x290 fs/super.c:1528 do_new_mount+0x2ba/0xb30 fs/namespace.c:3005 path_mount+0x671/0x1070 fs/namespace.c:3335 do_mount fs/namespace.c:3348 [inline] __do_sys_mount fs/namespace.c:3556 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3533 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3533 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ff7167deeba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff715455e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff715455ef0 RCX: 00007ff7167deeba RDX: 0000000020000580 RSI: 00000000200005c0 RDI: 00007ff715455eb0 RBP: 0000000020000580 R08: 00007ff715455ef0 R09: 0000000001008002 R10: 0000000001008002 R11: 0000000000000246 R12: 00000000200005c0 R13: 00007ff715455eb0 R14: 00000000000005f0 R15: 0000000020000280 Allocated by task 24301: 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:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 alloc_inode fs/inode.c:238 [inline] new_inode_pseudo+0x7c/0x220 fs/inode.c:972 new_inode+0x28/0x1c0 fs/inode.c:1001 debugfs_get_inode fs/debugfs/inode.c:72 [inline] __debugfs_create_file+0x144/0x510 fs/debugfs/inode.c:409 debugfs_create_file+0x4a/0x60 fs/debugfs/inode.c:461 debugfs_create_files block/blk-mq-debugfs.c:821 [inline] blk_mq_debugfs_register_hctx+0x35f/0x790 block/blk-mq-debugfs.c:888 blk_mq_debugfs_register+0x2e0/0x820 block/blk-mq-debugfs.c:843 blk_register_queue+0x1f6/0x380 block/blk-sysfs.c:878 device_add_disk+0x58c/0xd00 block/genhd.c:490 add_disk include/linux/genhd.h:212 [inline] loop_add+0x647/0x920 drivers/block/loop.c:2434 loop_control_ioctl+0x109/0x6f0 drivers/block/loop.c:2549 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:860 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860 x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125 destroy_inode fs/inode.c:291 [inline] evict+0x87d/0x930 fs/inode.c:637 iput_final fs/inode.c:1740 [inline] iput+0x63b/0x7e0 fs/inode.c:1766 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:380 __dentry_kill+0x447/0x660 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 dput+0x45/0x80 fs/dcache.c:893 find_next_child fs/libfs.c:264 [inline] simple_recursive_removal+0x26c/0x800 fs/libfs.c:279 debugfs_remove+0x49/0x70 fs/debugfs/inode.c:745 kvm_destroy_vm_debugfs virt/kvm/kvm_main.c:975 [inline] kvm_destroy_vm virt/kvm/kvm_main.c:1220 [inline] kvm_put_kvm+0x134/0x1270 virt/kvm/kvm_main.c:1283 kvm_vm_release+0x46/0x50 virt/kvm/kvm_main.c:1306 __fput+0x228/0x8c0 fs/file_table.c:280 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8881266c7a70 which belongs to the cache inode_cache of size 752 The buggy address is located 408 bytes to the right of 752-byte region [ffff8881266c7a70, ffff8881266c7d60) The buggy address belongs to the page: page:ffffea000499b100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1266c4 head:ffffea000499b100 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea00053b7400 0000000600000006 ffff8881001ccf00 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 23941, ts 1635976789596, free_ts 1626252612341 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3253 alloc_inode fs/inode.c:238 [inline] new_inode_pseudo+0x7c/0x220 fs/inode.c:972 new_inode+0x28/0x1c0 fs/inode.c:1001 debugfs_get_inode fs/debugfs/inode.c:72 [inline] __debugfs_create_file+0x144/0x510 fs/debugfs/inode.c:409 debugfs_create_file+0x4a/0x60 fs/debugfs/inode.c:461 kvm_create_vm_debugfs virt/kvm/kvm_main.c:1044 [inline] kvm_dev_ioctl_create_vm virt/kvm/kvm_main.c:4781 [inline] kvm_dev_ioctl+0x1812/0x1b20 virt/kvm/kvm_main.c:4808 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:860 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860 x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5855 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3388 do_slab_free mm/slub.c:3507 [inline] ___cache_free+0x109/0x120 mm/slub.c:3526 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:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 getname_flags+0xba/0x520 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 Memory state around the buggy address: ffff8881266c7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881266c7e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881266c7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881266c7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881266c7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs warning (device loop9): ext4_enable_quotas:6422: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop9): mount failed