================================================================== BUG: KASAN: use-after-free in __ext4_iget+0x2ee/0x3ef0 fs/ext4/inode.c:4824 Read of size 8 at addr ffff8880747d0f70 by task syz-executor.2/15278 CPU: 1 PID: 15278 Comm: syz-executor.2 Not tainted 6.1.69-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 __ext4_iget+0x2ee/0x3ef0 fs/ext4/inode.c:4824 ext4_quota_enable fs/ext4/super.c:6956 [inline] ext4_enable_quotas+0x54f/0xd40 fs/ext4/super.c:6992 __ext4_fill_super fs/ext4/super.c:5518 [inline] ext4_fill_super+0x81e6/0x8b50 fs/ext4/super.c:5664 get_tree_bdev+0x3fe/0x620 fs/super.c:1355 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa7c5c7e3ea 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:00007fa7c6a03ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa7c6a03f80 RCX: 00007fa7c5c7e3ea RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fa7c6a03f40 RBP: 0000000020000040 R08: 00007fa7c6a03f80 R09: 0000000000004500 R10: 0000000000004500 R11: 0000000000000202 R12: 0000000020000080 R13: 00007fa7c6a03f40 R14: 00000000000004dc R15: 00000000200000c0 Allocated by task 26186: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x10c/0x2d0 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3176 [inline] f2fs_alloc_inode+0x171/0x540 fs/f2fs/super.c:1398 alloc_inode fs/inode.c:259 [inline] new_inode_pseudo+0x61/0x1d0 fs/inode.c:1018 new_inode+0x25/0x1d0 fs/inode.c:1046 f2fs_new_inode+0x11d/0x1020 fs/f2fs/namei.c:191 f2fs_mkdir+0x123/0x520 fs/f2fs/namei.c:760 vfs_mkdir+0x3b6/0x590 fs/namei.c:4037 do_mkdirat+0x225/0x360 fs/namei.c:4062 __do_sys_mkdir fs/namei.c:4082 [inline] __se_sys_mkdir fs/namei.c:4080 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4080 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2812 dispose_list fs/inode.c:697 [inline] evict_inodes+0x601/0x6a0 fs/inode.c:747 generic_shutdown_super+0x94/0x340 fs/super.c:480 kill_block_super+0x7a/0xe0 fs/super.c:1459 kill_f2fs_super+0x2ff/0x3c0 fs/f2fs/super.c:4644 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2812 f2fs_put_super+0x65d/0xc00 fs/f2fs/super.c:1629 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7a/0xe0 fs/super.c:1459 kill_f2fs_super+0x2ff/0x3c0 fs/f2fs/super.c:4644 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880747d08e8 which belongs to the cache f2fs_inode_cache of size 2152 The buggy address is located 1672 bytes inside of 2152-byte region [ffff8880747d08e8, ffff8880747d1150) The buggy address belongs to the physical page: page:ffffea0001d1f400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880747d0000 pfn:0x747d0 head:ffffea0001d1f400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888077100201 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888016b66640 raw: ffff8880747d0000 00000000800e0001 00000001ffffffff ffff888077100201 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 4633, tgid 4628 (syz-executor.5), ts 266877558313, free_ts 266122682720 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x1a5/0x2d0 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3176 [inline] f2fs_alloc_inode+0x171/0x540 fs/f2fs/super.c:1398 alloc_inode fs/inode.c:259 [inline] iget_locked+0x1c8/0x830 fs/inode.c:1328 f2fs_iget+0x52/0x49e0 fs/f2fs/inode.c:497 f2fs_fill_super+0x4ab4/0x7cb0 fs/f2fs/super.c:4263 mount_bdev+0x2c9/0x3f0 fs/super.c:1432 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586 put_cpu_partial+0x17b/0x250 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 getname_flags+0xb8/0x4f0 fs/namei.c:139 user_path_at_empty+0x28/0x60 fs/namei.c:2876 do_readlinkat+0x114/0x3a0 fs/stat.c:468 __do_sys_readlink fs/stat.c:501 [inline] __se_sys_readlink fs/stat.c:498 [inline] __x64_sys_readlink+0x7b/0x90 fs/stat.c:498 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880747d0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880747d0e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880747d0f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880747d0f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880747d1000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================