Backport of:

From 9939a70b750edd9d05270060cc5cf62ca98cfbe5 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <msweet@msweet.org>
Date: Mon, 9 Sep 2024 10:03:10 -0400
Subject: [PATCH] Mirror IPP Everywhere printer changes from master.

---
 cups/ppd-cache.c | 10 +++++-----
 scheduler/ipp.c  |  9 ++++++++-
 2 files changed, 13 insertions(+), 6 deletions(-)

--- a/cups/ppd-cache.c
+++ b/cups/ppd-cache.c
@@ -4284,10 +4284,10 @@ _ppdCreateFromIPP2(
   }
   cupsFilePuts(fp, "\"\n");
 
-  if ((attr = ippFindAttribute(supported, "printer-more-info", IPP_TAG_URI)) != NULL)
+  if ((attr = ippFindAttribute(supported, "printer-more-info", IPP_TAG_URI)) != NULL && ippValidateAttribute(attr))
     cupsFilePrintf(fp, "*APSupplies: \"%s\"\n", ippGetString(attr, 0, NULL));
 
-  if ((attr = ippFindAttribute(supported, "printer-charge-info-uri", IPP_TAG_URI)) != NULL)
+  if ((attr = ippFindAttribute(supported, "printer-charge-info-uri", IPP_TAG_URI)) != NULL && ippValidateAttribute(attr))
     cupsFilePrintf(fp, "*cupsChargeInfoURI: \"%s\"\n", ippGetString(attr, 0, NULL));
 
   if ((attr = ippFindAttribute(supported, "printer-strings-uri", IPP_TAG_URI)) != NULL)
@@ -4356,10 +4356,10 @@ _ppdCreateFromIPP2(
   if (ippGetBoolean(ippFindAttribute(supported, "job-accounting-user-id-supported", IPP_TAG_BOOLEAN), 0))
     cupsFilePuts(fp, "*cupsJobAccountingUserId: True\n");
 
-  if ((attr = ippFindAttribute(supported, "printer-privacy-policy-uri", IPP_TAG_URI)) != NULL)
+  if ((attr = ippFindAttribute(supported, "printer-privacy-policy-uri", IPP_TAG_URI)) != NULL && ippValidateAttribute(attr))
     cupsFilePrintf(fp, "*cupsPrivacyURI: \"%s\"\n", ippGetString(attr, 0, NULL));
 
-  if ((attr = ippFindAttribute(supported, "printer-mandatory-job-attributes", IPP_TAG_KEYWORD)) != NULL)
+  if ((attr = ippFindAttribute(supported, "printer-mandatory-job-attributes", IPP_TAG_KEYWORD)) != NULL && ippValidateAttribute(attr))
   {
     char	prefix = '\"';		// Prefix for string
 
@@ -4377,7 +4377,7 @@ _ppdCreateFromIPP2(
     cupsFilePuts(fp, "\"\n");
   }
 
-  if ((attr = ippFindAttribute(supported, "printer-requested-job-attributes", IPP_TAG_KEYWORD)) != NULL)
+  if ((attr = ippFindAttribute(supported, "printer-requested-job-attributes", IPP_TAG_KEYWORD)) != NULL && ippValidateAttribute(attr))
   {
     char	prefix = '\"';		// Prefix for string
 
--- a/scheduler/ipp.c
+++ b/scheduler/ipp.c
@@ -5364,6 +5364,13 @@ create_local_bg_thread(
     cupsdLogMessage(CUPSD_LOG_DEBUG, "%s: IPP/1.1 Get-Printer-Attributes returned %s (%s)", printer->name, ippErrorString(cupsLastError()), cupsLastErrorString());
   }
 
+  // Validate response from printer...
+  if (!ippValidateAttributes(response))
+  {
+    cupsdLogMessage(CUPSD_LOG_ERROR, "%s: Printer returned invalid data: %s", printer->name, cupsLastErrorString());
+    return (NULL);
+  }
+
   // TODO: Grab printer icon file...
   httpClose(http);
 
