From: miod <miod@openbsd.org>
Date: Thu, 7 Aug 2014 20:02:23 +0000 (+0000)
Subject: Oops, revert changes commited by mistake. The previous commit was supposed
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=7e9f0113965a38b7be16a68c4ca4d4925fa428eb;p=openbsd

Oops, revert changes commited by mistake. The previous commit was supposed
to only apply to s23_srvr.c.
---

diff --git a/lib/libssl/d1_both.c b/lib/libssl/d1_both.c
index 2391d529947..aec6e272bfe 100644
--- a/lib/libssl/d1_both.c
+++ b/lib/libssl/d1_both.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_both.c,v 1.25 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_both.c,v 1.26 2014/08/07 20:02:23 miod Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -903,7 +903,6 @@ dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 
 		i = s->method->ssl3_enc->final_finish_mac(s, sender, slen,
 		    s->s3->tmp.finish_md);
-		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		s->s3->tmp.finish_md_len = i;
 		memcpy(p, s->s3->tmp.finish_md, i);
 		p += i;
@@ -914,10 +913,12 @@ dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 		 * renegotiation checks
 		 */
 		if (s->type == SSL_ST_CONNECT) {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_client_finished,
 			    s->s3->tmp.finish_md, i);
 			s->s3->previous_client_finished_len = i;
 		} else {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_server_finished,
 			    s->s3->tmp.finish_md, i);
 			s->s3->previous_server_finished_len = i;
diff --git a/lib/libssl/d1_clnt.c b/lib/libssl/d1_clnt.c
index 165f9441f60..c9ec32173bd 100644
--- a/lib/libssl/d1_clnt.c
+++ b/lib/libssl/d1_clnt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_clnt.c,v 1.32 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_clnt.c,v 1.33 2014/08/07 20:02:23 miod Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -778,9 +778,8 @@ dtls1_client_hello(SSL *s)
 
 		/* if client_random is initialized, reuse it, we are
 		 * required to use same upon reply to HelloVerify */
-		for (i = 0; i < sizeof(s->s3->client_random); i++)
-			if (p[i] != '\0')
-				break;
+		for (i = 0; p[i]=='\0' && i < sizeof(s->s3->client_random); i++)
+			;
 		if (i == sizeof(s->s3->client_random))
 			RAND_pseudo_bytes(p, sizeof(s->s3->client_random));
 
@@ -1339,6 +1338,7 @@ dtls1_send_client_certificate(SSL *s)
 		/* If we get an error, we need to
 		 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
 		 * We then get retied later */
+		i = 0;
 		i = ssl_do_client_cert_cb(s, &x509, &pkey);
 		if (i < 0) {
 			s->rwstate = SSL_X509_LOOKUP;
diff --git a/lib/libssl/d1_pkt.c b/lib/libssl/d1_pkt.c
index 5be89f0955b..7b0d67bf151 100644
--- a/lib/libssl/d1_pkt.c
+++ b/lib/libssl/d1_pkt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_pkt.c,v 1.33 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_pkt.c,v 1.34 2014/08/07 20:02:23 miod Exp $ */
 /* 
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
@@ -414,12 +414,10 @@ dtls1_process_record(SSL *s)
 		}
 
 		i = s->method->ssl3_enc->mac(s, md, 0 /* not send */);
-		if (i < 0 || mac == NULL ||
-		    timingsafe_memcmp(md, mac, (size_t)mac_size) != 0)
+		if (i < 0 || mac == NULL || timingsafe_memcmp(md, mac, (size_t)mac_size) != 0)
 			enc_err = -1;
 		if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)
 			enc_err = -1;
-		OPENSSL_cleanse(&md, sizeof md);
 	}
 
 	if (enc_err < 0) {
diff --git a/lib/libssl/s3_both.c b/lib/libssl/s3_both.c
index afcaca3c434..6ba3d4bfcef 100644
--- a/lib/libssl/s3_both.c
+++ b/lib/libssl/s3_both.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_both.c,v 1.27 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: s3_both.c,v 1.28 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -161,7 +161,7 @@ ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 		p = &(d[4]);
 
 		i = s->method->ssl3_enc->final_finish_mac(s,
-		    sender, slen, s->s3->tmp.finish_md);
+		sender, slen, s->s3->tmp.finish_md);
 		if (i == 0)
 			return 0;
 		s->s3->tmp.finish_md_len = i;
@@ -171,14 +171,15 @@ ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 
                 /* Copy the finished so we can use it for
                    renegotiation checks */
-		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		if (s->type == SSL_ST_CONNECT) {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_client_finished,
-			    s->s3->tmp.finish_md, i);
+			s->s3->tmp.finish_md, i);
 			s->s3->previous_client_finished_len = i;
 		} else {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_server_finished,
-			    s->s3->tmp.finish_md, i);
+			s->s3->tmp.finish_md, i);
 			s->s3->previous_server_finished_len = i;
 		}
 
@@ -215,7 +216,7 @@ ssl3_take_mac(SSL *s)
 	}
 
 	s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
-	    sender, slen, s->s3->tmp.peer_finish_md);
+	sender, slen, s->s3->tmp.peer_finish_md);
 }
 #endif
 
@@ -249,7 +250,7 @@ ssl3_get_finished(SSL *s, int a, int b)
 	p = (unsigned char *)s->init_msg;
 	i = s->s3->tmp.peer_finish_md_len;
 
-	if (i != n || i > EVP_MAX_MD_SIZE) {
+	if (i != n) {
 		al = SSL_AD_DECODE_ERROR;
 		SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_BAD_DIGEST_LENGTH);
 		goto f_err;
@@ -264,12 +265,14 @@ ssl3_get_finished(SSL *s, int a, int b)
         /* Copy the finished so we can use it for
            renegotiation checks */
 	if (s->type == SSL_ST_ACCEPT) {
+		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		memcpy(s->s3->previous_client_finished,
-		    s->s3->tmp.peer_finish_md, i);
+		s->s3->tmp.peer_finish_md, i);
 		s->s3->previous_client_finished_len = i;
 	} else {
+		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		memcpy(s->s3->previous_server_finished,
-		    s->s3->tmp.peer_finish_md, i);
+		s->s3->tmp.peer_finish_md, i);
 		s->s3->previous_server_finished_len = i;
 	}
 
diff --git a/lib/libssl/s3_lib.c b/lib/libssl/s3_lib.c
index aa091f51c7c..4631c517ccc 100644
--- a/lib/libssl/s3_lib.c
+++ b/lib/libssl/s3_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_lib.c,v 1.72 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: s3_lib.c,v 1.73 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -2333,7 +2333,7 @@ ssl3_new(SSL *s)
 	SSL3_STATE	*s3;
 
 	if ((s3 = calloc(1, sizeof *s3)) == NULL)
-		return 0;
+		goto err;
 	memset(s3->rrec.seq_num, 0, sizeof(s3->rrec.seq_num));
 	memset(s3->wrec.seq_num, 0, sizeof(s3->wrec.seq_num));
 
@@ -2341,6 +2341,8 @@ ssl3_new(SSL *s)
 
 	s->method->ssl_clear(s);
 	return (1);
+err:
+	return (0);
 }
 
 void
diff --git a/lib/libssl/src/ssl/d1_both.c b/lib/libssl/src/ssl/d1_both.c
index 2391d529947..aec6e272bfe 100644
--- a/lib/libssl/src/ssl/d1_both.c
+++ b/lib/libssl/src/ssl/d1_both.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_both.c,v 1.25 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_both.c,v 1.26 2014/08/07 20:02:23 miod Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -903,7 +903,6 @@ dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 
 		i = s->method->ssl3_enc->final_finish_mac(s, sender, slen,
 		    s->s3->tmp.finish_md);
-		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		s->s3->tmp.finish_md_len = i;
 		memcpy(p, s->s3->tmp.finish_md, i);
 		p += i;
@@ -914,10 +913,12 @@ dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 		 * renegotiation checks
 		 */
 		if (s->type == SSL_ST_CONNECT) {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_client_finished,
 			    s->s3->tmp.finish_md, i);
 			s->s3->previous_client_finished_len = i;
 		} else {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_server_finished,
 			    s->s3->tmp.finish_md, i);
 			s->s3->previous_server_finished_len = i;
diff --git a/lib/libssl/src/ssl/d1_clnt.c b/lib/libssl/src/ssl/d1_clnt.c
index 165f9441f60..c9ec32173bd 100644
--- a/lib/libssl/src/ssl/d1_clnt.c
+++ b/lib/libssl/src/ssl/d1_clnt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_clnt.c,v 1.32 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_clnt.c,v 1.33 2014/08/07 20:02:23 miod Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -778,9 +778,8 @@ dtls1_client_hello(SSL *s)
 
 		/* if client_random is initialized, reuse it, we are
 		 * required to use same upon reply to HelloVerify */
-		for (i = 0; i < sizeof(s->s3->client_random); i++)
-			if (p[i] != '\0')
-				break;
+		for (i = 0; p[i]=='\0' && i < sizeof(s->s3->client_random); i++)
+			;
 		if (i == sizeof(s->s3->client_random))
 			RAND_pseudo_bytes(p, sizeof(s->s3->client_random));
 
@@ -1339,6 +1338,7 @@ dtls1_send_client_certificate(SSL *s)
 		/* If we get an error, we need to
 		 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
 		 * We then get retied later */
+		i = 0;
 		i = ssl_do_client_cert_cb(s, &x509, &pkey);
 		if (i < 0) {
 			s->rwstate = SSL_X509_LOOKUP;
diff --git a/lib/libssl/src/ssl/d1_pkt.c b/lib/libssl/src/ssl/d1_pkt.c
index 5be89f0955b..7b0d67bf151 100644
--- a/lib/libssl/src/ssl/d1_pkt.c
+++ b/lib/libssl/src/ssl/d1_pkt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_pkt.c,v 1.33 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: d1_pkt.c,v 1.34 2014/08/07 20:02:23 miod Exp $ */
 /* 
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
@@ -414,12 +414,10 @@ dtls1_process_record(SSL *s)
 		}
 
 		i = s->method->ssl3_enc->mac(s, md, 0 /* not send */);
-		if (i < 0 || mac == NULL ||
-		    timingsafe_memcmp(md, mac, (size_t)mac_size) != 0)
+		if (i < 0 || mac == NULL || timingsafe_memcmp(md, mac, (size_t)mac_size) != 0)
 			enc_err = -1;
 		if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)
 			enc_err = -1;
-		OPENSSL_cleanse(&md, sizeof md);
 	}
 
 	if (enc_err < 0) {
diff --git a/lib/libssl/src/ssl/s3_both.c b/lib/libssl/src/ssl/s3_both.c
index afcaca3c434..6ba3d4bfcef 100644
--- a/lib/libssl/src/ssl/s3_both.c
+++ b/lib/libssl/src/ssl/s3_both.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_both.c,v 1.27 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: s3_both.c,v 1.28 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -161,7 +161,7 @@ ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 		p = &(d[4]);
 
 		i = s->method->ssl3_enc->final_finish_mac(s,
-		    sender, slen, s->s3->tmp.finish_md);
+		sender, slen, s->s3->tmp.finish_md);
 		if (i == 0)
 			return 0;
 		s->s3->tmp.finish_md_len = i;
@@ -171,14 +171,15 @@ ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 
                 /* Copy the finished so we can use it for
                    renegotiation checks */
-		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		if (s->type == SSL_ST_CONNECT) {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_client_finished,
-			    s->s3->tmp.finish_md, i);
+			s->s3->tmp.finish_md, i);
 			s->s3->previous_client_finished_len = i;
 		} else {
+			OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 			memcpy(s->s3->previous_server_finished,
-			    s->s3->tmp.finish_md, i);
+			s->s3->tmp.finish_md, i);
 			s->s3->previous_server_finished_len = i;
 		}
 
@@ -215,7 +216,7 @@ ssl3_take_mac(SSL *s)
 	}
 
 	s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
-	    sender, slen, s->s3->tmp.peer_finish_md);
+	sender, slen, s->s3->tmp.peer_finish_md);
 }
 #endif
 
@@ -249,7 +250,7 @@ ssl3_get_finished(SSL *s, int a, int b)
 	p = (unsigned char *)s->init_msg;
 	i = s->s3->tmp.peer_finish_md_len;
 
-	if (i != n || i > EVP_MAX_MD_SIZE) {
+	if (i != n) {
 		al = SSL_AD_DECODE_ERROR;
 		SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_BAD_DIGEST_LENGTH);
 		goto f_err;
@@ -264,12 +265,14 @@ ssl3_get_finished(SSL *s, int a, int b)
         /* Copy the finished so we can use it for
            renegotiation checks */
 	if (s->type == SSL_ST_ACCEPT) {
+		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		memcpy(s->s3->previous_client_finished,
-		    s->s3->tmp.peer_finish_md, i);
+		s->s3->tmp.peer_finish_md, i);
 		s->s3->previous_client_finished_len = i;
 	} else {
+		OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 		memcpy(s->s3->previous_server_finished,
-		    s->s3->tmp.peer_finish_md, i);
+		s->s3->tmp.peer_finish_md, i);
 		s->s3->previous_server_finished_len = i;
 	}
 
diff --git a/lib/libssl/src/ssl/s3_enc.c b/lib/libssl/src/ssl/s3_enc.c
index 913a256f28e..f268a2a265c 100644
--- a/lib/libssl/src/ssl/s3_enc.c
+++ b/lib/libssl/src/ssl/s3_enc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_enc.c,v 1.53 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: s3_enc.c,v 1.54 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -607,7 +607,7 @@ ssl3_handshake_mac(SSL *s, int md_nid, const char *sender, int len,
 	if (!EVP_MD_CTX_copy_ex(&ctx, d))
 		return 0;
 	n = EVP_MD_CTX_size(&ctx);
-	if (n <= 0)
+	if (n < 0)
 		return 0;
 
 	npad = (48 / n) * n;
@@ -655,7 +655,7 @@ n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
 	}
 
 	t = EVP_MD_CTX_size(hash);
-	if (t <= 0)
+	if (t < 0)
 		return -1;
 	md_size = t;
 	npad = (48 / md_size) * md_size;
diff --git a/lib/libssl/src/ssl/s3_lib.c b/lib/libssl/src/ssl/s3_lib.c
index aa091f51c7c..4631c517ccc 100644
--- a/lib/libssl/src/ssl/s3_lib.c
+++ b/lib/libssl/src/ssl/s3_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_lib.c,v 1.72 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: s3_lib.c,v 1.73 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -2333,7 +2333,7 @@ ssl3_new(SSL *s)
 	SSL3_STATE	*s3;
 
 	if ((s3 = calloc(1, sizeof *s3)) == NULL)
-		return 0;
+		goto err;
 	memset(s3->rrec.seq_num, 0, sizeof(s3->rrec.seq_num));
 	memset(s3->wrec.seq_num, 0, sizeof(s3->wrec.seq_num));
 
@@ -2341,6 +2341,8 @@ ssl3_new(SSL *s)
 
 	s->method->ssl_clear(s);
 	return (1);
+err:
+	return (0);
 }
 
 void
diff --git a/lib/libssl/src/ssl/t1_enc.c b/lib/libssl/src/ssl/t1_enc.c
index bec8328269b..6ad721bd8ae 100644
--- a/lib/libssl/src/ssl/t1_enc.c
+++ b/lib/libssl/src/ssl/t1_enc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: t1_enc.c,v 1.68 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: t1_enc.c,v 1.69 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -319,7 +319,7 @@ tls1_aead_ctx_init(SSL_AEAD_CTX **aead_ctx)
 
 static int
 tls1_change_cipher_state_aead(SSL *s, char is_read, const unsigned char *key,
-    unsigned int key_len, const unsigned char *iv, unsigned int iv_len)
+    unsigned key_len, const unsigned char *iv, unsigned iv_len)
 {
 	const EVP_AEAD *aead = s->s3->tmp.new_aead;
 	SSL_AEAD_CTX *aead_ctx;
@@ -856,7 +856,6 @@ tls1_enc(SSL *s, int send)
 				rec->length += pad;
 			}
 		} else if ((bs != 1) && send) {
-			/* XXX divide by zero if bs == 0 (should not happen) */
 			i = bs - ((int)l % bs);
 
 			/* Add weird padding of upto 256 bytes */
@@ -1121,7 +1120,7 @@ tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 		currentvalpos++;
 		val[currentvalpos] = contextlen & 0xff;
 		currentvalpos++;
-		if (contextlen != 0 && context != NULL) {
+		if ((contextlen > 0) || (context != NULL)) {
 			memcpy(val + currentvalpos, context, contextlen);
 		}
 	}
diff --git a/lib/libssl/t1_enc.c b/lib/libssl/t1_enc.c
index bec8328269b..6ad721bd8ae 100644
--- a/lib/libssl/t1_enc.c
+++ b/lib/libssl/t1_enc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: t1_enc.c,v 1.68 2014/08/07 19:46:31 miod Exp $ */
+/* $OpenBSD: t1_enc.c,v 1.69 2014/08/07 20:02:23 miod Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -319,7 +319,7 @@ tls1_aead_ctx_init(SSL_AEAD_CTX **aead_ctx)
 
 static int
 tls1_change_cipher_state_aead(SSL *s, char is_read, const unsigned char *key,
-    unsigned int key_len, const unsigned char *iv, unsigned int iv_len)
+    unsigned key_len, const unsigned char *iv, unsigned iv_len)
 {
 	const EVP_AEAD *aead = s->s3->tmp.new_aead;
 	SSL_AEAD_CTX *aead_ctx;
@@ -856,7 +856,6 @@ tls1_enc(SSL *s, int send)
 				rec->length += pad;
 			}
 		} else if ((bs != 1) && send) {
-			/* XXX divide by zero if bs == 0 (should not happen) */
 			i = bs - ((int)l % bs);
 
 			/* Add weird padding of upto 256 bytes */
@@ -1121,7 +1120,7 @@ tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 		currentvalpos++;
 		val[currentvalpos] = contextlen & 0xff;
 		currentvalpos++;
-		if (contextlen != 0 && context != NULL) {
+		if ((contextlen > 0) || (context != NULL)) {
 			memcpy(val + currentvalpos, context, contextlen);
 		}
 	}