================================================================== BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:4963 [inline] BUG: KASAN: use-after-free in __ext4_iget+0x384/0x4330 fs/ext4/inode.c:5011 Read of size 8 at addr ffff8881b25b7180 by task syz-executor.3/20725 CPU: 1 PID: 20725 Comm: syz-executor.3 Not tainted 5.4.249-syzkaller-00001-geffd75159534 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 check_igot_inode fs/ext4/inode.c:4963 [inline] __ext4_iget+0x384/0x4330 fs/ext4/inode.c:5011 ext4_quota_enable fs/ext4/super.c:6055 [inline] ext4_enable_quotas+0x528/0x940 fs/ext4/super.c:6091 ext4_fill_super+0x84d4/0x8d70 fs/ext4/super.c:4708 mount_bdev+0x267/0x370 fs/super.c:1417 legacy_get_tree+0xdf/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount+0x292/0x570 fs/namespace.c:2843 do_mount+0x688/0xe10 fs/namespace.c:3163 ksys_mount+0xc2/0xf0 fs/namespace.c:3372 __do_sys_mount fs/namespace.c:3386 [inline] __se_sys_mount fs/namespace.c:3383 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 19348: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 f2fs_alloc_inode+0x22/0x3c0 fs/f2fs/super.c:1241 alloc_inode fs/inode.c:231 [inline] iget_locked+0x143/0x790 fs/inode.c:1192 f2fs_iget+0x52/0x4970 fs/f2fs/inode.c:490 f2fs_fill_super+0x6a23/0x8310 fs/f2fs/super.c:4079 mount_bdev+0x267/0x370 fs/super.c:1417 legacy_get_tree+0xdf/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount+0x292/0x570 fs/namespace.c:2843 do_mount+0x688/0xe10 fs/namespace.c:3163 ksys_mount+0xc2/0xf0 fs/namespace.c:3372 __do_sys_mount fs/namespace.c:3386 [inline] __se_sys_mount fs/namespace.c:3383 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 19368: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167 rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881b25b6cc0 which belongs to the cache f2fs_inode_cache of size 1264 The buggy address is located 1216 bytes inside of 1264-byte region [ffff8881b25b6cc0, ffff8881b25b71b0) The buggy address belongs to the page: page:ffffea0006c96c00 refcount:1 mapcount:0 mapping:ffff8881f0fde000 index:0xffff8881b25b3660 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0fde000 raw: ffff8881b25b3660 0000000080170008 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) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x109/0x250 mm/slub.c:2842 f2fs_alloc_inode+0x22/0x3c0 fs/f2fs/super.c:1241 alloc_inode fs/inode.c:231 [inline] iget_locked+0x143/0x790 fs/inode.c:1192 f2fs_iget+0x52/0x4970 fs/f2fs/inode.c:490 f2fs_lookup+0x416/0xee0 fs/f2fs/namei.c:529 lookup_open fs/namei.c:3288 [inline] do_last fs/namei.c:3401 [inline] path_openat+0x159a/0x3480 fs/namei.c:3614 do_filp_open+0x20b/0x450 fs/namei.c:3644 do_sys_open+0x39c/0x810 fs/open.c:1113 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 __slab_free+0x34b/0x360 mm/slub.c:3012 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 user_path_at_empty+0x28/0x50 fs/namei.c:2683 user_path_at include/linux/namei.h:49 [inline] vfs_statx+0x115/0x210 fs/stat.c:187 vfs_fstatat include/linux/fs.h:3372 [inline] __do_sys_newfstatat fs/stat.c:367 [inline] __se_sys_newfstatat+0xce/0x770 fs/stat.c:361 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881b25b7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b25b7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881b25b7180: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ^ ffff8881b25b7200: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ffff8881b25b7280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop3): ext4_enable_quotas:6099: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop3): mount failed