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net/mail: escape arbitrary input when including them in errors

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This ensures that input with unexpected characters like control
characters will not be interpreted in unintended ways should they ever
be printed or logged.

Change-Id: I9ee18b44d8ca067886dca065e5aae9266a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/780041
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Nicholas Husin <husin@google.com>
This commit is contained in:
Nicholas S. Husin 2026-05-19 15:04:41 -04:00 • committed by Nicholas Husin
parent 0db7bea636
commit edf006c9a3
1 changed files with 2 additions and 2 deletions
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4
src/net/mail/message.go
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@ -81,7 +81,7 @@ func readHeader(r *textproto.Reader) (map[string][]string, error) {
if err != nil {
return m, err
}
return m, errors.New("malformed initial line: " + line)
return m, fmt.Errorf("malformed initial line: %q", line)
}
for {
@ -93,7 +93,7 @@ func readHeader(r *textproto.Reader) (map[string][]string, error) {
// Key ends at first colon.
k, v, ok := strings.Cut(kv, ":")
if !ok {
return m, errors.New("malformed header line: " + kv)
return m, fmt.Errorf("malformed header line: %q", kv)
}
key := textproto.CanonicalMIMEHeaderKey(k)