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Kernel-VFS: Fixed kernel crash if parent custody is null

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In VFS::rename, if new_path is equal to '/', then, parent custody is
set to null.
VFS::rename would then use parent custody without checking it first.

Fixed VFS::rename to check both old and new path parent custody
before actually using them.
This commit is contained in:
r-paiva 2021-05-06 18:35:34 +01:00 • committed by Andreas Kling
parent 90b6f999e5
commit 293a5c2b49
1 changed files with 4 additions and 0 deletions
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4
Kernel/FileSystem/VirtualFileSystem.cpp
View file

@ -498,6 +498,10 @@ KResult VFS::rename(StringView old_path, StringView new_path, Custody& base)
return new_custody_or_error.error();
}
if (!old_parent_custody || !new_parent_custody) {
return EPERM;
}
auto& old_parent_inode = old_parent_custody->inode();
auto& new_parent_inode = new_parent_custody->inode();