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ipn: add a comment about skipping files with null bytes

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Updates #954
This commit is contained in:
Brad Fitzpatrick 2020-11-24 11:07:49 -08:00
parent 72e082aaf5
commit cd6099113f
1 changed files with 5 additions and 0 deletions
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5
ipn/prefs.go
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@ -278,6 +278,11 @@ func LoadPrefs(filename string) (*Prefs, error) {
return nil, fmt.Errorf("LoadPrefs open: %w", err) // err includes path return nil, fmt.Errorf("LoadPrefs open: %w", err) // err includes path
} }
if bytes.Contains(data, jsonEscapedZero) { if bytes.Contains(data, jsonEscapedZero) {
// Tailscale 1.2.0 - 1.2.8 on Windows had a memory corruption bug
// in the backend process that ended up sending NULL bytes over JSON
// to the frontend which wrote them out to JSON files on disk.
// So if we see one, treat is as corrupt and the user will need
// to log in again. (better than crashing)
return nil, os.ErrNotExist return nil, os.ErrNotExist
} }
p, err := PrefsFromBytes(data, false) p, err := PrefsFromBytes(data, false)