================================================================== BUG: KASAN: use-after-free in __ext4_iget+0x254/0x31b4 fs/ext4/inode.c:4824 Read of size 8 at addr ffff000108231310 by task syz-executor.1/14113 CPU: 1 PID: 14113 Comm: syz-executor.1 Not tainted 6.1.76-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __ext4_iget+0x254/0x31b4 fs/ext4/inode.c:4824 __ext4_fill_super fs/ext4/super.c:5399 [inline] ext4_fill_super+0x5a44/0x7570 fs/ext4/super.c:5664 get_tree_bdev+0x360/0x54c fs/super.c:1355 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5694 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 10438: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 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+0x1ac/0x2f8 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3177 [inline] reiserfs_alloc_inode+0x2c/0xc4 fs/reiserfs/super.c:642 alloc_inode fs/inode.c:261 [inline] iget5_locked+0xa4/0x234 fs/inode.c:1285 reiserfs_fill_super+0x1088/0x2028 fs/reiserfs/super.c:2053 mount_bdev+0x274/0x370 fs/super.c:1432 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2844 destroy_inode fs/inode.c:316 [inline] evict+0x5fc/0x68c fs/inode.c:681 dispose_list fs/inode.c:699 [inline] evict_inodes+0x6b4/0x74c fs/inode.c:749 generic_shutdown_super+0x9c/0x328 fs/super.c:480 kill_block_super+0x70/0xdc fs/super.c:1459 reiserfs_kill_sb+0x134/0x14c fs/reiserfs/super.c:570 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2148/0x3474 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2844 destroy_inode fs/inode.c:316 [inline] evict+0x5fc/0x68c fs/inode.c:681 iput_final fs/inode.c:1791 [inline] iput+0x7c0/0x8a4 fs/inode.c:1817 reiserfs_new_inode+0xc24/0x1724 fs/reiserfs/inode.c:2156 reiserfs_mkdir+0x4ac/0x77c fs/reiserfs/namei.c:845 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] create_privroot fs/reiserfs/xattr.c:882 [inline] reiserfs_xattr_init+0x2b0/0x6bc fs/reiserfs/xattr.c:1005 reiserfs_fill_super+0x1bfc/0x2028 fs/reiserfs/super.c:2175 mount_bdev+0x274/0x370 fs/super.c:1432 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff000108230d40 which belongs to the cache reiser_inode_cache of size 1568 The buggy address is located 1488 bytes inside of 1568-byte region [ffff000108230d40, ffff000108231360) The buggy address belongs to the physical page: page:00000000e3635fbc refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff000108230d40 pfn:0x148230 head:00000000e3635fbc order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000c90c9001 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0004335200 dead000000000002 ffff0000c4118780 raw: ffff000108230d40 0000000080130002 00000001ffffffff ffff0000c90c9001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000108231200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff000108231280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff000108231300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff000108231380: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00 ffff000108231400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop1): __ext4_fill_super:5399: inode #2: comm syz-executor.1: unexpected EA_INODE flag EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed