================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x578/0x9f0 Read of size 48 at addr ffff0001264c6ff0 by task syz-executor.0/4369 CPU: 0 PID: 4369 Comm: syz-executor.0 Not tainted 6.1.36-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 leaf_paste_in_buffer+0x578/0x9f0 leaf_copy_dir_entries+0x2b4/0xa04 fs/reiserfs/lbalance.c:108 leaf_copy_boundary_item+0x8c4/0x1a34 fs/reiserfs/lbalance.c:168 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0xa0c/0x1f7c fs/reiserfs/lbalance.c:726 leaf_shift_left+0xc8/0x39c fs/reiserfs/lbalance.c:750 balance_leaf_insert_left fs/reiserfs/do_balan.c:339 [inline] balance_leaf_left fs/reiserfs/do_balan.c:611 [inline] balance_leaf+0x189c/0xe860 fs/reiserfs/do_balan.c:1409 do_balance+0x27c/0x788 fs/reiserfs/do_balan.c:1888 reiserfs_insert_item+0x940/0xa84 fs/reiserfs/stree.c:2261 reiserfs_get_block+0x18c0/0x45d8 fs/reiserfs/inode.c:868 __block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041 reiserfs_write_begin+0x328/0x71c fs/reiserfs/inode.c:2775 generic_perform_write+0x278/0x55c mm/filemap.c:3754 __generic_file_write_iter+0x168/0x388 mm/filemap.c:3882 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:3914 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x914 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __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:581 The buggy address belongs to the physical page: page:00000000cfcd2b5c refcount:3 mapcount:0 mapping:00000000c6e1f919 index:0x214 pfn:0x1664c6 memcg:ffff0000d3e74000 aops:def_blk_aops ino:700000 flags: 0x5ffc60000002042(referenced|workingset|private|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc60000002042 0000000000000000 dead000000000122 ffff0000c0486b10 raw: 0000000000000214 ffff0000e2415570 00000003ffffffff ffff0000d3e74000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0001264c6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0001264c6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0001264c7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0001264c7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0001264c7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3937, free_space(entry_count) 2 REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck? REISERFS (device loop0): Remounting filesystem read-only REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 3 0x0 SD] stat data REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3937, free_space(entry_count) 2 REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck? REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 3 0x0 SD] stat data