CVE-2023-54281: In the Linux kernel, the following vulnerability has been resolved:  btrfs: release path before inode lookup during the ino lookup ioctl  During the ino lookup ioctl we can end up calling btrfs_iget() to get an inode reference while we are holding on a root's btree. If btrfs_iget() needs to lookup the inode from the root's btree, because it's not currently loaded in memory, then it will need to lock another or the same path in the same root btree. This may result in a deadlock and trigger the following lockdep splat:    WARNING: possible circular locking dependency detected   6.5.0-rc7-syzkaller-00004-gf7757129e3de #0 Not tainted   ------------------------------------------------------   syz-executor277/5012 is trying to acquire lock:   ffff88802df41710 (btrfs-tree-01){++++}-{3:3}, at: __btrfs_tree_read_lock+0x2f/0x220 fs/btrfs/locking.c:136    but task is already holding lock:   ffff88802df418e8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x2f/0x220 fs/btrfs/locking.c:136    which lock already depends on the new lock.    the existing dependency chain (in reverse order) is:    -> #1 (btrfs-tree-00){++++}-{3:3}:          down_read_nested+0x49/0x2f0 kernel/locking/rwsem.c:1645          __btrfs_tree_read_lock+0x2f/0x220 fs/btrfs/locking.c:136          btrfs_search_slot+0x13a4/0x2f80 fs/btrfs/ctree.c:2302          btrfs_init_root_free_objectid+0x148/0x320 fs/btrfs/disk-io.c:4955          btrfs_init_fs_root fs/btrfs/disk-io.c:1128 [inline]          btrfs_get_root_ref+0x5ae/0xae0 fs/btrfs/disk-io.c:1338          btrfs_get_fs_root fs/btrfs/disk-io.c:1390 [inline]          open_ctree+0x29c8/0x3030 fs/btrfs/disk-io.c:3494          btrfs_fill_super+0x1c7/0x2f0 fs/btrfs/super.c:1154          btrfs_mount_root+0x7e0/0x910 fs/btrfs/super.c:1519          legacy_get_tree+0xef/0x190 fs/fs_context.c:611          vfs_get_tree+0x8c/0x270 fs/super.c:1519          fc_mount fs/namespace.c:1112 [inline]          vfs_kern_mount+0xbc/0x150 fs/namespace.c:1142          btrfs_mount+0x39f/0xb50 fs/btrfs/super.c:1579          legacy_get_tree+0xef/0x190 fs/fs_context.c:611          vfs_get_tree+0x8c/0x270 fs/super.c:1519          do_new_mount+0x28f/0xae0 fs/namespace.c:3335          do_mount fs/namespace.c:3675 [inline]          __do_sys_mount fs/namespace.c:3884 [inline]          __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861          do_syscall_x64 arch/x86/entry/common.c:50 [inline]          do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80          entry_SYSCALL_64_after_hwframe+0x63/0xcd    -> #0 (btrfs-tree-01){++++}-{3:3}:          check_prev_add kernel/locking/lockdep.c:3142 [inline]          check_prevs_add kernel/locking/lockdep.c:3261 [inline]          validate_chain kernel/locking/lockdep.c:3876 [inline]          __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144          lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761          down_read_nested+0x49/0x2f0 kernel/locking/rwsem.c:1645          __btrfs_tree_read_lock+0x2f/0x220 fs/btrfs/locking.c:136          btrfs_tree_read_lock fs/btrfs/locking.c:142 [inline]          btrfs_read_lock_root_node+0x292/0x3c0 fs/btrfs/locking.c:281          btrfs_search_slot_get_root fs/btrfs/ctree.c:1832 [inline]          btrfs_search_slot+0x4ff/0x2f80 fs/btrfs/ctree.c:2154          btrfs_lookup_inode+0xdc/0x480 fs/btrfs/inode-item.c:412          btrfs_read_locked_inode fs/btrfs/inode.c:3892 [inline]          btrfs_iget_path+0x2d9/0x1520 fs/btrfs/inode.c:5716          btrfs_search_path_in_tree_user fs/btrfs/ioctl.c:1961 [inline]          btrfs_ioctl_ino_lookup_user+0x77a/0xf50 fs/btrfs/ioctl.c:2105          btrfs_ioctl+0xb0b/0xd40 fs/btrfs/ioctl.c:4683          vfs_ioctl fs/ioctl.c:51 [inline]          __do_sys_ioctl fs/ioctl.c:870 [inline]          __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:856          do_syscall_x64 arch/x86/entry/common.c:50 [inline]          do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80          entry_SYSCALL_64_after_hwframe+0x63/0xcd    other info  ---truncated---