================================================================== 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 ffff8881d2e866a0 by task syz-executor.2/10168 CPU: 1 PID: 10168 Comm: syz-executor.2 Tainted: G W 5.4.274-syzkaller-00002-g6f97bd951d82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 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:1426 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1556 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 RIP: 0033:0x7f8fb785962a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8fb6bb0ef8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8fb6bb0f80 RCX: 00007f8fb785962a RDX: 00000000200004c0 RSI: 0000000020000500 RDI: 00007f8fb6bb0f40 RBP: 00000000200004c0 R08: 00007f8fb6bb0f80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000500 R13: 00007f8fb6bb0f40 R14: 00000000000004a6 R15: 0000000020000240 Allocated by task 8412: 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:1234 f2fs_iget+0x52/0x4970 fs/f2fs/inode.c:490 f2fs_fill_super+0x4ce5/0x8310 fs/f2fs/super.c:3963 mount_bdev+0x267/0x370 fs/super.c:1426 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1556 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 7059: 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 ffff8881d2e861e0 which belongs to the cache f2fs_inode_cache of size 1264 The buggy address is located 1216 bytes inside of 1264-byte region [ffff8881d2e861e0, ffff8881d2e866d0) The buggy address belongs to the page: page:ffffea00074ba000 refcount:1 mapcount:0 mapping:ffff8881f0ff8c80 index:0xffff8881d2e84140 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f0ff8c80 raw: ffff8881d2e84140 0000000080170001 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:1234 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:1426 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1556 do_new_mount+0x292/0x570 fs/namespace.c:2843 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:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 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 fib_table_insert+0x6d3/0x19b0 net/ipv4/fib_trie.c:1258 fib_magic net/ipv4/fib_frontend.c:1103 [inline] fib_add_ifaddr+0xe1e/0x1a40 net/ipv4/fib_frontend.c:1147 fib_netdev_event+0x1f0/0x550 net/ipv4/fib_frontend.c:1487 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 __dev_notify_flags+0x26e/0x510 net/core/dev.c:1670 dev_change_flags+0xe7/0x190 net/core/dev.c:8015 Memory state around the buggy address: ffff8881d2e86580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d2e86600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d2e86680: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ^ ffff8881d2e86700: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ffff8881d2e86780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop2): ext4_enable_quotas:6100: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop2): mount failed