From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Mon, 29 Feb 2016 08:58:40 +0000 (+0100)
Subject: cipher.c: Fixes to prevent undefined behavior (found with libubsan)
X-Git-Tag: gnutls_3_5_0~289
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=60f3560ba5f2ccf3adf5ebf7e2eea9907d555cff;p=thirdparty%2Fgnutls.git

cipher.c: Fixes to prevent undefined behavior (found with libubsan)
---

diff --git a/lib/nettle/cipher.c b/lib/nettle/cipher.c
index 602f5c72b7..bf99985338 100644
--- a/lib/nettle/cipher.c
+++ b/lib/nettle/cipher.c
@@ -578,7 +578,8 @@ wrap_nettle_cipher_setiv(void *_ctx, const void *iv, size_t iv_size)
 	if (ctx->cipher->set_iv) {
 		ctx->cipher->set_iv(ctx->ctx_ptr, iv_size, iv);
 	} else {
-		memcpy(ctx->iv, iv, iv_size);
+		if (iv)
+			memcpy(ctx->iv, iv, iv_size);
 		ctx->iv_size = iv_size;
 	}