vcpkg/ports/qt5-base/patches/CVE-2023-33285-qtbase-5.15.diff
2023-06-16 16:14:53 -07:00

69 lines
2.8 KiB
Diff

--- a/src/network/kernel/qdnslookup_unix.cpp
+++ b/src/network/kernel/qdnslookup_unix.cpp
@@ -227,7 +227,6 @@ 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;
@@ -260,18 +259,31 @@ 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));
@@ -283,6 +295,11 @@ 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
@@ -290,6 +307,8 @@ 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) {