REISERFS (device loop0): Using tea hash to sort names REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1) ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x198/0xa0c fs/reiserfs/lbalance.c:1017 Write of size 3936 at addr ffff0000ed7f3140 by task syz.0.17/4946 CPU: 1 PID: 4946 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189 memmove+0xb4/0xe8 mm/kasan/shadow.c:55 leaf_paste_in_buffer+0x198/0xa0c fs/reiserfs/lbalance.c:1017 leaf_copy_boundary_item+0x930/0x19dc fs/reiserfs/lbalance.c:199 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0x694/0xb9c fs/reiserfs/lbalance.c:726 leaf_shift_left+0xc8/0x3ac fs/reiserfs/lbalance.c:750 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x21f8/0xd2f4 fs/reiserfs/do_balan.c:1409 do_balance+0x260/0x778 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x5b4/0x6d0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1458/0x34b0 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012 __block_write_begin+0x40/0x54 fs/buffer.c:2062 reiserfs_write_begin+0x3c8/0x654 fs/reiserfs/inode.c:2790 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 generic_cont_expand_simple+0xf0/0x1a0 fs/buffer.c:2362 reiserfs_setattr+0x380/0xd70 fs/reiserfs/inode.c:3319 notify_change+0xa08/0xcd8 fs/attr.c:505 do_truncate+0x178/0x1f0 fs/open.c:65 do_sys_ftruncate+0x284/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the page: page:00000000f1dd583e refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12d7f3 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003ab1e08 fffffc0003b600c8 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ed7f3000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000ed7f3080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000ed7f3100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000ed7f3180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000ed7f3200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4946 at include/trace/events/preemptirq.h:38 trace_irq_disable include/trace/events/preemptirq.h:36 [inline] WARNING: CPU: 0 PID: 4946 at include/trace/events/preemptirq.h:38 trace_hardirqs_off_finish+0x348/0x634 kernel/trace/trace_preemptirq.c:67 Modules linked in: CPU: 0 PID: 4946 Comm: syz.0.17 Tainted: G B D W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : trace_irq_disable include/trace/events/preemptirq.h:36 [inline] pc : trace_hardirqs_off_finish+0x348/0x634 kernel/trace/trace_preemptirq.c:67 lr : trace_irq_disable include/trace/events/preemptirq.h:36 [inline] lr : trace_hardirqs_off_finish+0x348/0x634 kernel/trace/trace_preemptirq.c:67 sp : ffff80001f6b61c0 x29: ffff80001f6b61d0 x28: ffff0000c2528000 x27: dfff800000000000 x26: ffff8000167cb000 x25: 1ffff00002cf9702 x24: 1fffe000184a5001 x23: dfff800000000000 x22: 0000000000000030 x21: 0080000000000000 x20: ffff80001418d310 x19: 0000000000000001 x18: 1fffe00034218796 x17: 1fffe00034218796 x16: ffff8000111ceed0 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000084da114 x8 : ffff0000c2528000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000ed7f4f90 x4 : 0000000000000000 x3 : 0000000000000010 x2 : 0000000000000008 x1 : ffff8000117dcc60 x0 : 0000000000000000 Call trace: trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_hardirqs_off_finish+0x348/0x634 kernel/trace/trace_preemptirq.c:67 __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:51 [inline] enter_from_kernel_mode+0x9c/0x178 arch/arm64/kernel/entry-common.c:56 enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227 el1_interrupt+0x24/0x58 arch/arm64/kernel/entry-common.c:453 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 __memcpy+0x164/0x250 arch/arm64/lib/memcpy.S:180 leaf_paste_in_buffer+0x198/0xa0c fs/reiserfs/lbalance.c:1017 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:465 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x8b4c/0xd2f4 fs/reiserfs/do_balan.c:1409 do_balance+0x260/0x778 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x5b4/0x6d0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1458/0x34b0 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012 __block_write_begin+0x40/0x54 fs/buffer.c:2062 reiserfs_write_begin+0x3c8/0x654 fs/reiserfs/inode.c:2790 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 generic_cont_expand_simple+0xf0/0x1a0 fs/buffer.c:2362 reiserfs_setattr+0x380/0xd70 fs/reiserfs/inode.c:3319 notify_change+0xa08/0xcd8 fs/attr.c:505 do_truncate+0x178/0x1f0 fs/open.c:65 do_sys_ftruncate+0x284/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 40790 hardirqs last enabled at (40789): [] lookup_bh_lru fs/buffer.c:1294 [inline] hardirqs last enabled at (40789): [] __find_get_block+0x1c8/0xcd8 fs/buffer.c:1306 hardirqs last disabled at (40790): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (40790): [] _raw_spin_lock_irqsave+0xfc/0x14c kernel/locking/spinlock.c:162 softirqs last enabled at (40690): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (40688): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace 8664271be471aa49 ]---