================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x631/0xab0 Read of size 192 at addr ffff88806fb16fa0 by task syz-executor208/3630 CPU: 0 PID: 3630 Comm: syz-executor208 Not tainted 5.15.140-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 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_paste_left_whole fs/reiserfs/do_balan.c:560 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:594 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x3484/0x12510 fs/reiserfs/do_balan.c:1409 do_balance+0x309/0x8f0 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x73b/0x880 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x226a/0x5390 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x60b/0x1650 fs/buffer.c:2012 reiserfs_write_begin+0x346/0x810 fs/reiserfs/inode.c:2790 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3903 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3935 call_write_iter include/linux/fs.h:2103 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 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: 0033:0x7f292abe5d09 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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:00007f292aba2218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f292ac6f6c8 RCX: 00007f292abe5d09 RDX: 000000000208e24b RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 00007f292ac6f6c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f292ac3bbf4 R13: 00007f292ac3b1d8 R14: 0065766973727563 R15: 0030656c69662f2e The buggy address belongs to the page: page:ffffea0001bec580 refcount:2 mapcount:0 mapping:ffff88814084e6b0 index:0x258 pfn:0x6fb16 memcg:ffff888011e3c000 aops:def_blk_aops ino:700001 flags: 0xfff00000002032(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002032 ffffea0001bce648 ffffea0001b9ee08 ffff88814084e6b0 raw: 0000000000000258 ffff888074617828 00000002ffffffff ffff888011e3c000 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 3630, ts 165686043851, free_ts 165684956545 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_paste_into_item+0x65d/0x880 fs/reiserfs/stree.c:2130 reiserfs_get_block+0x226a/0x5390 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x60b/0x1650 fs/buffer.c:2012 reiserfs_write_begin+0x346/0x810 fs/reiserfs/inode.c:2790 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3903 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3935 call_write_iter include/linux/fs.h:2103 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 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] shmem_undo_range+0x67a/0x1b50 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x21b/0xa00 mm/shmem.c:1145 evict+0x2a4/0x620 fs/inode.c:587 __dentry_kill+0x436/0x650 fs/dcache.c:582 dentry_kill+0xbb/0x290 dput+0x1f1/0x420 fs/dcache.c:888 __fput+0x5ec/0x890 fs/file_table.c:288 task_work_run+0x129/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff88806fb16f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806fb16f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88806fb17000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88806fb17080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88806fb17100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================