================================================================== BUG: KASAN: out-of-bounds in leaf_paste_in_buffer+0x1bc/0xab0 fs/reiserfs/lbalance.c:1017 Read of size 18446744073709551305 at addr ffff8880b9954000 by task syz-executor425/5060 CPU: 0 PID: 5060 Comm: syz-executor425 Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 leaf_paste_in_buffer+0x1bc/0xab0 fs/reiserfs/lbalance.c:1017 balance_leaf_new_nodes_paste_whole fs/reiserfs/do_balan.c:1171 [inline] balance_leaf_new_nodes_paste fs/reiserfs/do_balan.c:1215 [inline] balance_leaf_new_nodes fs/reiserfs/do_balan.c:1246 [inline] balance_leaf+0x6680/0x12510 fs/reiserfs/do_balan.c:1450 do_balance+0x30d/0x8f0 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x732/0x870 fs/reiserfs/stree.c:2158 reiserfs_get_block+0x2250/0x5130 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x54d/0x1ac0 fs/buffer.c:2119 reiserfs_write_begin+0x24d/0x520 fs/reiserfs/inode.c:2767 generic_cont_expand_simple+0x18b/0x2a0 fs/buffer.c:2473 reiserfs_setattr+0x57d/0x1140 fs/reiserfs/inode.c:3298 notify_change+0xb99/0xe60 fs/attr.c:499 do_truncate+0x220/0x300 fs/open.c:66 do_sys_ftruncate+0x2f3/0x390 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fc139a99679 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff88956dd8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fc139a99679 RDX: 00007fc139a99679 RSI: 0000000002007fff RDI: 0000000000000005 RBP: 00007fc139b0d610 R08: 00007fff88956fa8 R09: 00007fff88956fa8 R10: 00007fff88956fa8 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff88956f98 R14: 0000000000000001 R15: 0000000000000001 The buggy address belongs to the physical page: page:ffffea0002e65500 refcount:2 mapcount:0 mapping:ffff888073fb18d8 index:0x3b0 pfn:0xb9954 memcg:ffff888016262000 aops:ext4_da_aops ino:785 dentry name:"strace-static-x86_64" flags: 0xfff0000000803c(referenced|uptodate|dirty|lru|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff0000000803c ffffea0001fc8688 ffffea0001e5cf88 ffff888073fb18d8 raw: 00000000000003b0 ffff88807d9ab570 00000002ffffffff ffff888016262000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x141cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_WRITE), pid 4990, tgid 4990 (sftp-server), ts 49327544209, free_ts 49037746604 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x339a/0x3530 mm/page_alloc.c:3312 __alloc_pages+0x255/0x670 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_pages mm/mempolicy.c:2204 [inline] folio_alloc+0x12a/0x330 mm/mempolicy.c:2211 filemap_alloc_folio+0xde/0x500 mm/filemap.c:974 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1918 ext4_da_write_begin+0x5b5/0xa40 fs/ext4/inode.c:2891 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1dc/0x19b0 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x792/0xb20 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x92a/0xa50 mm/page_alloc.c:2347 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2533 release_pages+0x2113/0x23f0 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:392 unmap_region+0x300/0x350 mm/mmap.c:2341 do_vmi_align_munmap+0x121e/0x1850 mm/mmap.c:2657 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2725 __vm_munmap+0x230/0x450 mm/mmap.c:3012 __do_sys_munmap mm/mmap.c:3029 [inline] __se_sys_munmap mm/mmap.c:3026 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:3026 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff8880b9953f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880b9953f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880b9954000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880b9954080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880b9954100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================