From 4c3f77e871820d055a5f6c4cd7a6ac47a7f3877d Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 9 Jun 2022 09:27:24 +0200
Subject: [PATCH] krb5: return error properly on decode errors

---
 lib/krb5.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

Index: curl-7.81.0/lib/krb5.c
===================================================================
--- curl-7.81.0.orig/lib/krb5.c
+++ curl-7.81.0/lib/krb5.c
@@ -146,11 +146,8 @@ krb5_decode(void *app_data, void *buf, i
   enc.value = buf;
   enc.length = len;
   maj = gss_unwrap(&min, *context, &enc, &dec, NULL, NULL);
-  if(maj != GSS_S_COMPLETE) {
-    if(len >= 4)
-      strcpy(buf, "599 ");
+  if(maj != GSS_S_COMPLETE)
     return -1;
-  }
 
   memcpy(buf, dec.value, dec.length);
   len = curlx_uztosi(dec.length);
@@ -512,6 +509,7 @@ static CURLcode read_data(struct connect
 {
   int len;
   CURLcode result;
+  int nread;
 
   result = socket_read(fd, &len, sizeof(len));
   if(result)
@@ -520,7 +518,10 @@ static CURLcode read_data(struct connect
   if(len) {
     /* only realloc if there was a length */
     len = ntohl(len);
-    buf->data = Curl_saferealloc(buf->data, len);
+    if(len > CURL_MAX_INPUT_LENGTH)
+      len = 0;
+    else
+      buf->data = Curl_saferealloc(buf->data, len);
   }
   if(!len || !buf->data)
     return CURLE_OUT_OF_MEMORY;
@@ -528,8 +529,11 @@ static CURLcode read_data(struct connect
   result = socket_read(fd, buf->data, len);
   if(result)
     return result;
-  buf->size = conn->mech->decode(conn->app_data, buf->data, len,
-                                 conn->data_prot, conn);
+  nread = conn->mech->decode(conn->app_data, buf->data, len,
+                             conn->data_prot, conn);
+  if(nread < 0)
+    return CURLE_RECV_ERROR;
+  buf->size = (size_t)nread;
   buf->index = 0;
   return CURLE_OK;
 }