krb5 commit [krb5-1.13]: Fix memory leak in SPNEGO gss_init_sec_context()

[Tom Yu]

https://github.com/krb5/krb5/commit/fd0eb62f85e1f57d07aec72bec73a90f5032b60b
commit fd0eb62f85e1f57d07aec72bec73a90f5032b60b
Author: Greg Hudson <ghudson at mit.edu>
Date:   Wed Nov 25 14:43:35 2015 -0500

    Fix memory leak in SPNEGO gss_init_sec_context()
    
    After the initial call to spnego_gss_init_sec_context(), the context
    handle can leak if init_ctx_cont() returns an error, because the
    cleanup handler assumes that spnego_ctx contains the value of
    *context_handle.  Fix this leak by setting spnego_ctx before the if
    block which contains that call.  Reported by Adam Bernstein.
    
    (cherry picked from commit 159dbbd5ff14fdc2fa71fb3a8804eb401c914399)
    
    ticket: 8281
    version_fixed: 1.13.4
    tags: -pullup
    status: resolved

 src/lib/gssapi/spnego/spnego_mech.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/lib/gssapi/spnego/spnego_mech.c b/src/lib/gssapi/spnego/spnego_mech.c
index ec38eea..ce157c5 100644
--- a/src/lib/gssapi/spnego/spnego_mech.c
+++ b/src/lib/gssapi/spnego/spnego_mech.c
@@ -1024,7 +1024,8 @@ spnego_gss_init_sec_context(
 
 	/* Step 1: perform mechanism negotiation. */
 	spcred = (spnego_gss_cred_id_t)claimant_cred_handle;
-	if (*context_handle == GSS_C_NO_CONTEXT) {
+	spnego_ctx = (spnego_gss_ctx_id_t)*context_handle;
+	if (spnego_ctx == NULL) {
 		ret = init_ctx_new(minor_status, spcred,
 				   context_handle, &send_token);
 		if (ret != GSS_S_CONTINUE_NEEDED) {