Rewrite/simplify BN_free().

ok tb@

1 files changed, 12 insertions, 10 deletions

diff --git a/src/lib/libcrypto/bn/bn_lib.c b/src/lib/libcrypto/bn/bn_lib.c
index 70b6899a42..e8802300ce 100644
--- a/src/lib/libcrypto/bn/bn_lib.c
+++ b/src/lib/libcrypto/bn/bn_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_lib.c,v 1.70 2023/01/07 16:13:46 jsing Exp $ */
+/* $OpenBSD: bn_lib.c,v 1.71 2023/01/07 16:17:29 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -97,18 +97,20 @@ BN_clear(BIGNUM *a)
 }
 
 void
-BN_free(BIGNUM *a)
+BN_free(BIGNUM *bn)
 {
-        int i;
+        if (bn == NULL)
+                return;
 
-        if (a == NULL)
+        if (!BN_get_flags(bn, BN_FLG_STATIC_DATA))
+                freezero(bn->d, bn->dmax * sizeof(bn->d[0]));
+
+        if (!BN_get_flags(bn, BN_FLG_MALLOCED)) {
+                explicit_bzero(bn, sizeof(*bn));
                 return;
-        if (a->d != NULL && !(BN_get_flags(a, BN_FLG_STATIC_DATA)))
-                freezero(a->d, a->dmax * sizeof(a->d[0]));
-        i = BN_get_flags(a, BN_FLG_MALLOCED);
-        explicit_bzero(a, sizeof(BIGNUM));
-        if (i)
-                free(a);
+        }
+
+        freezero(bn, sizeof(*bn));
 }
 
 void