Fixed problem with multiple load-unload of comp zlib

Signed-off-by: Rich Salz <rsalz@akamai.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>

diff --git a/crypto/comp/c_zlib.c b/crypto/comp/c_zlib.c
index 6a57f7092645d2dcb4e1583fe15da3dfcef1b703..f0fc0aff9e59fad30fc4677014236f8b80704965 100644 (file)
--- a/crypto/comp/c_zlib.c
+++ b/crypto/comp/c_zlib.c
@@ -309,7 +309,9 @@ COMP_METHOD *COMP_zlib(void)
 void COMP_zlib_cleanup(void)
 {
 #ifdef ZLIB_SHARED
-    DSO_free(zlib_dso);
+    if (zlib_dso != NULL)
+        DSO_free(zlib_dso);
+    zlib_dso = NULL;
 #endif
 }