krb5/Correct-error-handling-bug-in-prior-commit.patch

From ec5bfaec762cff5eea4cac43a5be59992616fc27 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Thu, 23 Mar 2017 13:42:55 -0400
Subject: [PATCH] Correct error handling bug in prior commit

In crypto_encode_der_cert(), if the second i2d_X509() invocation
fails, make sure to free the allocated pointer and not the
possibly-modified alias.

ticket: 8561
(cherry picked from commit 7fdaef7c3280c86b5df25ae061fb04cc56d8620c)
---
 src/plugins/preauth/pkinit/pkinit_crypto_openssl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
index a5b010b26..90c30dbf5 100644
--- a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
+++ b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
@@ -6196,10 +6196,10 @@ crypto_encode_der_cert(krb5_context context, pkinit_req_crypto_context reqctx,
     if (len <= 0)
         return EINVAL;
     p = der = malloc(len);
-    if (p == NULL)
+    if (der == NULL)
         return ENOMEM;
     if (i2d_X509(reqctx->received_cert, &p) <= 0) {
-        free(p);
+        free(der);
         return EINVAL;
     }
     *der_out = der;