If an engine comes up explicitely, it must also come down explicitely
In apps/apps.c, one can set up an engine with setup_engine().
However, we freed the structural reference immediately, which means
that for engines that don't already have a structural reference
somewhere else (because it's a built in engine), we end up returning
an invalid reference.
Instead, the function release_engine() is added, and called at the end
of the routines that call setup_engine().
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1643)
diff --git a/apps/dsa.c b/apps/dsa.c
index f608d7d..7f98512 100644
--- a/apps/dsa.c
+++ b/apps/dsa.c
@@ -249,6 +249,7 @@
end:
BIO_free_all(out);
DSA_free(dsa);
+ release_engine(e);
OPENSSL_free(passin);
OPENSSL_free(passout);
return (ret);
