Add patch to fix CVE-2023-33285 (Closes: #1036848).

debian/changelog

@@ -1,5 +1,8 @@
 qt6-base (6.4.2+dfsg-10) UNRELEASED; urgency=medium
 
+  [ Patrick Franz ]
+  * Add patch to fix CVE-2023-33285 (Closes: #1036848).
+
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sun, 28 May 2023 10:04:09 +0200
 
 qt6-base (6.4.2+dfsg-9) unstable; urgency=medium

debian/patches/cve-2023-33285.diff

@@ -0,0 +1,70 @@
+diff --git a/src/network/kernel/qdnslookup_unix.cpp b/src/network/kernel/qdnslookup_unix.cpp
+index 75f7c6c440..de0113494f 100644
+--- a/src/network/kernel/qdnslookup_unix.cpp
++++ b/src/network/kernel/qdnslookup_unix.cpp
+@@ -193,7 +193,6 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
+     // responseLength in case of error, we still can extract the
+     // exact error code from the response.
+     HEADER *header = (HEADER*)response;
+-    const int answerCount = ntohs(header->ancount);
+     switch (header->rcode) {
+     case NOERROR:
+         break;
+@@ -226,18 +225,31 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
+         return;
+     }
+
+-    // Skip the query host, type (2 bytes) and class (2 bytes).
+     char host[PACKETSZ], answer[PACKETSZ];
+     unsigned char *p = response + sizeof(HEADER);
+-    int status = local_dn_expand(response, response + responseLength, p, host, sizeof(host));
+-    if (status < 0) {
++    int status;
++
++    if (ntohs(header->qdcount) == 1) {
++        // Skip the query host, type (2 bytes) and class (2 bytes).
++        status = local_dn_expand(response, response + responseLength, p, host, sizeof(host));
++        if (status < 0) {
++            reply->error = QDnsLookup::InvalidReplyError;
++            reply->errorString = tr("Could not expand domain name");
++            return;
++        }
++        if ((p - response) + status + 4 >= responseLength)
++            header->qdcount = 0xffff;   // invalid reply below
++        else
++            p += status + 4;
++    }
++    if (ntohs(header->qdcount) > 1) {
+         reply->error = QDnsLookup::InvalidReplyError;
+-        reply->errorString = tr("Could not expand domain name");
++        reply->errorString = tr("Invalid reply received");
+         return;
+     }
+-    p += status + 4;
+
+     // Extract results.
++    const int answerCount = ntohs(header->ancount);
+     int answerIndex = 0;
+     while ((p < response + responseLength) && (answerIndex < answerCount)) {
+         status = local_dn_expand(response, response + responseLength, p, host, sizeof(host));
+@@ -249,6 +261,11 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
+         const QString name = QUrl::fromAce(host);
+
+         p += status;
++
++        if ((p - response) + 10 > responseLength) {
++            // probably just a truncated reply, return what we have
++            return;
++        }
+         const quint16 type = (p[0] << 8) | p[1];
+         p += 2; // RR type
+         p += 2; // RR class
+@@ -256,6 +273,8 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
+         p += 4;
+         const quint16 size = (p[0] << 8) | p[1];
+         p += 2;
++        if ((p - response) + size > responseLength)
++            return;             // truncated
+
+         if (type == QDnsLookup::A) {
+             if (size != 4) {

debian/patches/series

@@ -1,6 +1,7 @@
-# fixed in 6.5
+# fixed in 6.5.1
 cve-2023-32762.diff
 cve-2023-32763.diff
+cve-2023-33285.diff
 upstream_Add-HPPA-detection.patch
 upstream_Add-M68k-detection.patch