REISERFS (device loop4): checking transaction log (loop4) REISERFS (device loop4): Using r5 hash to sort names REISERFS (device loop4): using 3.5.x disk format REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x631/0xab0 Read of size 48 at addr ffff888045070ff0 by task syz-executor.4/22121 CPU: 1 PID: 22121 Comm: syz-executor.4 Not tainted 5.15.143-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:189 memcpy+0x25/0x60 mm/kasan/shadow.c:65 leaf_paste_in_buffer+0x631/0xab0 leaf_copy_dir_entries+0x71a/0xc60 fs/reiserfs/lbalance.c:108 leaf_copy_boundary_item+0xbbe/0x21b0 fs/reiserfs/lbalance.c:168 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0xcd0/0x28a0 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xba/0x430 fs/reiserfs/lbalance.c:750 balance_leaf+0x15cd/0x12510 fs/reiserfs/do_balan.c:1409 do_balance+0x309/0x8f0 fs/reiserfs/do_balan.c:1888 reiserfs_insert_item+0xb56/0xcb0 fs/reiserfs/stree.c:2261 reiserfs_new_inode+0x11f9/0x1d90 fs/reiserfs/inode.c:2062 reiserfs_mkdir+0x5ac/0x8f0 fs/reiserfs/namei.c:845 vfs_mkdir+0x419/0x640 fs/namei.c:3994 do_mkdirat+0x260/0x520 fs/namei.c:4019 __do_sys_mkdir fs/namei.c:4039 [inline] __se_sys_mkdir fs/namei.c:4037 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fedce76bba9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fedccced0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fedce88af80 RCX: 00007fedce76bba9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007fedce7b747a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fedce88af80 R15: 00007ffc7c831e88 The buggy address belongs to the page: page:ffffea0001141c00 refcount:3 mapcount:0 mapping:ffff888145a51470 index:0x214 pfn:0x45070 memcg:ffff888077100000 aops:def_blk_aops ino:700004 flags: 0xfff00000002022(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002022 0000000000000000 dead000000000122 ffff888145a51470 raw: 0000000000000214 ffff8880a416b3a0 00000003ffffffff ffff888077100000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 22121, ts 2559939480533, free_ts 2559936762074 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 __page_cache_alloc+0xd4/0x4a0 mm/filemap.c:1022 pagecache_get_page+0xa91/0x1010 mm/filemap.c:1940 find_or_create_page include/linux/pagemap.h:420 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x22a/0xaf0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] get_empty_nodes+0x8c1/0xd70 fs/reiserfs/fix_node.c:890 fix_nodes+0x2615/0x8c70 fs/reiserfs/fix_node.c:2662 reiserfs_insert_item+0xa7a/0xcb0 fs/reiserfs/stree.c:2240 reiserfs_new_directory+0x5c1/0x990 fs/reiserfs/inode.c:1854 reiserfs_new_inode+0x12ba/0x1d90 fs/reiserfs/inode.c:2076 reiserfs_mkdir+0x5ac/0x8f0 fs/reiserfs/namei.c:845 vfs_mkdir+0x419/0x640 fs/namei.c:3994 do_mkdirat+0x260/0x520 fs/namei.c:4019 __do_sys_mkdir fs/namei.c:4039 [inline] __se_sys_mkdir fs/namei.c:4037 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433 release_pages+0x1bb9/0x1f40 mm/swap.c:963 __pagevec_release+0x80/0xf0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x48b/0x1290 mm/truncate.c:329 truncate_inode_pages mm/truncate.c:425 [inline] truncate_pagecache mm/truncate.c:735 [inline] truncate_setsize+0xcb/0xf0 mm/truncate.c:760 reiserfs_setattr+0xa40/0xf90 fs/reiserfs/inode.c:3408 notify_change+0xc6d/0xf50 fs/attr.c:505 do_truncate+0x21c/0x300 fs/open.c:65 do_sys_ftruncate+0x2eb/0x390 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888045070f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888045070f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888045071000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888045071080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888045071100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================