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pdh: prevent registry deadlocks via exponential buffer growth (#2438)

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Signed-off-by: Harshal Patel <hp842484@gmail.com>
This commit is contained in:
Harshal Patel
2026-07-01 00:30:38 +05:30
committed by GitHub
parent 3fd3638687
commit ff41a590ea
1 changed files with 4 additions and 3 deletions
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7
internal/pdh/registry/perflib.go
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@@ -243,9 +243,10 @@ func queryRawData(query string) ([]byte, error) {
switch {
case errors.Is(err, error(windows.ERROR_MORE_DATA)):
newBuffer := make([]byte, len(buffer)+16384)
copy(newBuffer, buffer)
buffer = newBuffer
// Exponential buffer growth prevents O(N) allocation spin-loops under heavy load.
// The previous copy() was removed because the buffer contents are
// incomplete/invalid and will be overwritten on the next API call.
buffer = make([]byte, len(buffer)*2)
continue
case errors.Is(err, error(windows.ERROR_BUSY)):