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Rollup merge of #107900 - ChrisDenton:zero-header, r=thomcc

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Zero the `REPARSE_MOUNTPOINT_DATA_BUFFER` header

Makes sure the full header is correctly initialized.

Fixes #107884
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Dylan DPC 2023-02-11 11:15:58 +05:30 committed by GitHub
commit a50c379fcd
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library/std/src/sys/windows/fs.rs
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@ -1393,6 +1393,8 @@ fn symlink_junction_inner(original: &Path, junction: &Path) -> io::Result<()> {
let mut data = Align8([MaybeUninit::<u8>::uninit(); c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE]);
let data_ptr = data.0.as_mut_ptr();
let db = data_ptr.cast::<c::REPARSE_MOUNTPOINT_DATA_BUFFER>();
// Zero the header to ensure it's fully initialized, including reserved parameters.
*db = mem::zeroed();
let buf = ptr::addr_of_mut!((*db).ReparseTarget).cast::<c::WCHAR>();
let mut i = 0;
// FIXME: this conversion is very hacky