================================================================== BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:4953 [inline] BUG: KASAN: use-after-free in __ext4_iget+0x384/0x4330 fs/ext4/inode.c:5001 Read of size 8 at addr ffff8881dd149510 by task syz.7.261/1397 CPU: 1 PID: 1397 Comm: syz.7.261 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:4953 [inline] __ext4_iget+0x384/0x4330 fs/ext4/inode.c:5001 ext4_quota_enable fs/ext4/super.c:6056 [inline] ext4_enable_quotas+0x528/0x940 fs/ext4/super.c:6092 ext4_fill_super+0x84f0/0x8d90 fs/ext4/super.c:4708 mount_bdev+0x267/0x370 fs/super.c:1428 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1558 do_new_mount+0x292/0x570 fs/namespace.c:2850 do_mount+0x688/0xe10 fs/namespace.c:3170 ksys_mount+0xc2/0xf0 fs/namespace.c:3379 __do_sys_mount fs/namespace.c:3393 [inline] __se_sys_mount fs/namespace.c:3390 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3390 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fb544a5c90a 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:00007fb5430c4e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb5430c4ef0 RCX: 00007fb544a5c90a RDX: 0000200000000140 RSI: 0000200000000640 RDI: 00007fb5430c4eb0 RBP: 0000200000000140 R08: 00007fb5430c4ef0 R09: 0000000003014850 R10: 0000000003014850 R11: 0000000000000246 R12: 0000200000000640 R13: 00007fb5430c4eb0 R14: 00000000000004c1 R15: 00002000000001c0 Allocated by task 940: 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:1273 f2fs_iget+0x52/0x4cf0 fs/f2fs/inode.c:499 f2fs_fill_super+0x6909/0x8330 fs/f2fs/super.c:4071 mount_bdev+0x267/0x370 fs/super.c:1428 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1558 do_new_mount+0x292/0x570 fs/namespace.c:2850 do_mount+0x688/0xe10 fs/namespace.c:3170 ksys_mount+0xc2/0xf0 fs/namespace.c:3379 __do_sys_mount fs/namespace.c:3393 [inline] __se_sys_mount fs/namespace.c:3390 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3390 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 0: 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 ffff8881dd149050 which belongs to the cache f2fs_inode_cache of size 1264 The buggy address is located 1216 bytes inside of 1264-byte region [ffff8881dd149050, ffff8881dd149540) The buggy address belongs to the page: page:ffffea0007745200 refcount:1 mapcount:0 mapping:ffff8881f0f8c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0f8c000 raw: 0000000000000000 0000000080170017 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:4893 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:1273 f2fs_iget+0x52/0x4cf0 fs/f2fs/inode.c:499 f2fs_fill_super+0x4d1b/0x8330 fs/f2fs/super.c:3963 mount_bdev+0x267/0x370 fs/super.c:1428 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1558 do_new_mount+0x292/0x570 fs/namespace.c:2850 page_owner free stack trace missing Memory state around the buggy address: ffff8881dd149400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dd149480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881dd149500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8881dd149580: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8881dd149600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop7): ext4_enable_quotas:6100: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop7): mount failed