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encoding/pem: don't reslice in failure modes

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We re-slice the data being processed at the stat of each loop. If the
var that we use to calculate where to re-slice is < 0 or > the length
of the remaining data, return instead of attempting to re-slice.

Change-Id: I1d6c2b6c596feedeea8feeaace370ea73ba02c4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/715260
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Roland Shoemaker 2025-10-27 08:15:48 -07:00 • committed by Gopher Robot
parent 34fec512ce
commit 9f6590f333
1 changed files with 3 additions and 0 deletions
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3
src/encoding/pem/pem.go
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@ -95,6 +95,9 @@ func Decode(data []byte) (p *Block, rest []byte) {
for {
// If we've already tried parsing a block, skip past the END we already
// saw.
if endTrailerIndex < 0 || endTrailerIndex > len(rest) {
return nil, data
}
rest = rest[endTrailerIndex:]
// Find the first END line, and then find the last BEGIN line before