krb5 commit: Fix gss_pseudo_random leak on zero length output

[Greg Hudson]

https://github.com/krb5/krb5/commit/a44945dfa6502d4cd99943b2448ada389bc22b73
commit a44945dfa6502d4cd99943b2448ada389bc22b73
Author: Greg Hudson <ghudson at mit.edu>
Date:   Sat Jan 18 13:03:32 2014 -0500

    Fix gss_pseudo_random leak on zero length output
    
    Nobody is likely to ever ask for zero bytes of output from
    gss_pseudo_random, but if they do, just return an empty buffer without
    allocating.  Otherwise we leak memory because gss_release_buffer
    doesn't do anything to buffers with length 0.
    
    ticket: 7838 (new)

 src/lib/gssapi/krb5/prf.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/lib/gssapi/krb5/prf.c b/src/lib/gssapi/krb5/prf.c
index a0fbcda..bfca89b 100644
--- a/src/lib/gssapi/krb5/prf.c
+++ b/src/lib/gssapi/krb5/prf.c
@@ -81,6 +81,9 @@ krb5_gss_pseudo_random(OM_uint32 *minor_status,
         goto cleanup;
     }
 
+    if (desired_output_len == 0)
+        return GSS_S_COMPLETE;
+
     prf_out->value = k5alloc(desired_output_len, &code);
     if (prf_out->value == NULL) {
         code = KG_INPUT_TOO_LONG;