e_tpm2: fix intermittent segfault with importable keys

The written parameter on the import unmarshal isn't set meaning it
contains a bogus value.  Occasionally this value causes a segfault, so
fix by setting the value to 0.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/e_tpm2.c b/e_tpm2.c
index 532db0e..167c3bf 100644
--- a/e_tpm2.c
+++ b/e_tpm2.c
@@ -517,6 +517,7 @@ static int tpm2_engine_load_key_core(ENGINE *e, EVP_PKEY **ppkey,
 		}
 		buf = priv_2b.t.buffer;
 		size = sizeof(priv_2b.t.buffer);
+		written = 0;
 		TSS_TPM2B_PRIVATE_Marshal(&iout.outPrivate, &written,
 					  &buf, &size);
 		app_data->priv = OPENSSL_malloc(written);