commit d38adc8f60f9f08298498747bd20c7ec11bfcb3d
Author: Daniel Stenberg <daniel@haxx.se>
Date:   Thu Jun 9 09:27:24 2022 +0200

    [Backport] krb5: return error properly on decode errors
    
    Offering: RTOS
    CVE: CVE-2022-32208
    Reference: upstream_commit_id=6ecdf5136b52af747e7bda08db9a748256b1cd09
    
    DTS/AR: DTS2022062910035
    type: LTS
    reason: fix CVE-2022-32208 for curl.
    weblink:https://github.com/curl/curl/commit/6ecdf5136b52af747e7bda08db9a748256b1cd09
    
    Bug: https://curl.se/docs/CVE-2022-32208.html
    CVE-2022-32208
    Reported-by: Harry Sintonen
    Closes #9051
    
    Signed-off-by: laiyuanyuan <laiyuanyuan.lai@huawei.com>

diff --git a/lib/krb5.c b/lib/krb5.c
index e25f52656..77930a84c 100644
--- a/lib/krb5.c
+++ b/lib/krb5.c
@@ -146,11 +146,8 @@ krb5_decode(void *app_data, void *buf, int len,
   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 connectdata *conn,
 {
   int len;
   CURLcode result;
+  int nread;
 
   result = socket_read(fd, &len, sizeof(len));
   if(result)
@@ -520,7 +518,10 @@ static CURLcode read_data(struct connectdata *conn,
   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 connectdata *conn,
   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;
 }