Potential NULL dereference in the error path; Coverity CID 21720

ok doug@ jsing@

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libcrypto/bn/bn_exp.c b/src/lib/libcrypto/bn/bn_exp.c
index eecab5163b..12de0c5a12 100644
--- a/src/lib/libcrypto/bn/bn_exp.c
+++ b/src/lib/libcrypto/bn/bn_exp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_exp.c,v 1.20 2015/02/09 15:49:22 jsing Exp $ */
+/* $OpenBSD: bn_exp.c,v 1.21 2015/02/14 15:13:24 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -164,7 +164,7 @@ BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
         ret = 1;
 
 err:
-        if (r != rr)
+        if (r != rr && rr != NULL)
                 BN_copy(r, rr);
         BN_CTX_end(ctx);
         bn_check_top(r);