From 806eb90c6b6db41ddcbde7fff2a9a0bdbcc2326f Mon Sep 17 00:00:00 2001
From: Levi Neely <lkn@darkstar.example.net>
Date: Tue, 3 Mar 2026 19:48:17 +0100
Subject: [PATCH] Fix pcl-zqv.4.12: add bounds check in trim_der_key

---
 pclsync/pssl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pclsync/pssl.c b/pclsync/pssl.c
index d95090d..735fdb4 100644
--- a/pclsync/pssl.c
+++ b/pclsync/pssl.c
@@ -621,6 +621,9 @@ static void trim_der_key(unsigned char *keydata, size_t *keylen) {
     }
     header_size = p - keydata;
     correct_len = header_size + len;
+    if (header_size > *keylen || correct_len > *keylen) {
+        return;
+    }
     trimmed = malloc(correct_len);
     if (!trimmed) return;
     memcpy(trimmed, keydata, correct_len);