REISERFS warning (device loop6): vs-13060 reiserfs_update_sd_size: stat data of object [2 5 0x0 SD] (nlink == 1) not found (pos 2) REISERFS warning (device loop6): vs-13060 reiserfs_update_sd_size: stat data of object [3 6 0x0 SD] (nlink == 2) not found (pos 1) ================================================================== BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0x458/0xe34 fs/reiserfs/namei.c:165 Read of size 4 at addr ffff0000e1c74fc4 by task syz.6.2799/12865 CPU: 1 PID: 12865 Comm: syz.6.2799 Not tainted 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x220 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:427 kasan_report+0xa8/0x100 mm/kasan/report.c:531 __asan_report_load_n_noabort+0x28/0x34 mm/kasan/report_generic.c:361 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0x458/0xe34 fs/reiserfs/namei.c:165 reiserfs_find_entry+0x260/0x13b8 fs/reiserfs/namei.c:322 reiserfs_lookup+0x15c/0x378 fs/reiserfs/namei.c:368 __lookup_slow+0x24c/0x370 fs/namei.c:1690 lookup_one_len+0x178/0x28c fs/namei.c:2740 open_xa_dir+0x384/0x5d4 fs/reiserfs/xattr.c:162 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0xd8/0xd94 fs/reiserfs/xattr.c:533 reiserfs_xattr_set+0x388/0x4a8 fs/reiserfs/xattr.c:633 trusted_set+0x98/0xec fs/reiserfs/xattr_trusted.c:31 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x228/0x28c fs/xattr.c:617 path_setxattr+0x12c/0x25c fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 4312: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x43c 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+0x1b0/0x298 mm/slub.c:3429 __d_alloc+0x44/0x684 fs/dcache.c:1774 d_alloc_anon fs/dcache.c:1873 [inline] d_alloc_cursor+0x48/0xd8 fs/dcache.c:1879 dcache_dir_open+0x3c/0x78 fs/libfs.c:83 do_dentry_open+0x730/0xfa8 fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1013 do_open fs/namei.c:3626 [inline] path_openat+0x1f48/0x2680 fs/namei.c:3783 do_filp_open+0x174/0x344 fs/namei.c:3810 do_sys_openat2+0x128/0x3d8 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 Freed by task 15: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x11c/0x324 mm/slub.c:3683 __d_free+0x28/0x38 fs/dcache.c:298 rcu_do_batch kernel/rcu/tree.c:2297 [inline] rcu_core+0x81c/0x18ac kernel/rcu/tree.c:2557 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2574 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849 dentry_free+0xa4/0x170 fs/dcache.c:-1 __dentry_kill+0x45c/0x598 fs/dcache.c:625 dentry_kill+0xc8/0x248 fs/dcache.c:-1 dput+0x238/0x454 fs/dcache.c:918 dcache_dir_close+0x40/0x54 fs/libfs.c:91 __fput+0x1bc/0x7c0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 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+0x98/0x138 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+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849 dentry_free+0xa4/0x170 fs/dcache.c:-1 __dentry_kill+0x45c/0x598 fs/dcache.c:625 dentry_kill+0xc8/0x248 fs/dcache.c:-1 dput+0x238/0x454 fs/dcache.c:918 do_renameat2+0x744/0xa54 fs/namei.c:5029 __do_sys_renameat fs/namei.c:5067 [inline] __se_sys_renameat fs/namei.c:5064 [inline] __arm64_sys_renameat+0xc8/0xe4 fs/namei.c:5064 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 ffff0000e1c74eb0 which belongs to the cache dentry of size 312 The buggy address is located 276 bytes inside of 312-byte region [ffff0000e1c74eb0, ffff0000e1c74fe8) The buggy address belongs to the physical page: page:00000000f742c713 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121c74 head:00000000f742c713 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d24fe601 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c03dc480 raw: 0000000000000000 0000000000150015 00000001ffffffff ffff0000d24fe601 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e1c74e80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ffff0000e1c74f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000e1c74f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ^ ffff0000e1c75000: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ffff0000e1c75080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== REISERFS warning (device loop6): vs-13060 reiserfs_update_sd_size: stat data of object [3 6 0x0 SD] (nlink == 3) not found (pos 1)