File openssl-CVE-2016-0705.patch of Package openssl.2020

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File openssl-CVE-2016-0705.patch of Package openssl.2020

commit 6c88c71b4e4825c7bc0489306d062d017634eb88
Author: Dr. Stephen Henson <steve@openssl.org>
Date:   Thu Feb 18 12:47:23 2016 +0000

Fix double free in DSA private key parsing.
    
    Fix double free bug when parsing malformed DSA private keys.
    
    Thanks to Adam Langley (Google/BoringSSL) for discovering this bug using
    libFuzzer.
    
    CVE-2016-0705
    
    Reviewed-by: Emilia Käsper <emilia@openssl.org>

Index: openssl-1.0.1i/crypto/dsa/dsa_ameth.c
===================================================================
--- openssl-1.0.1i.orig/crypto/dsa/dsa_ameth.c	2016-02-24 21:02:45.753766925 +0100
+++ openssl-1.0.1i/crypto/dsa/dsa_ameth.c	2016-02-24 21:05:27.755039994 +0100
@@ -201,6 +201,8 @@
 	STACK_OF(ASN1_TYPE) *ndsa = NULL;
 	DSA *dsa = NULL;
 
+    int ret = 0;
+
 	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
 		return 0;
 	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
@@ -281,23 +283,21 @@
 		}
 
 	EVP_PKEY_assign_DSA(pkey, dsa);
-	BN_CTX_free (ctx);
-	if(ndsa)
-		sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
-	else
-		ASN1_INTEGER_free(privkey);
 
-	return 1;
+    ret = 1;
+    goto done;
 
 	decerr:
-	DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
+    DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_DECODE_ERROR);
 	dsaerr:
-	BN_CTX_free (ctx);
-	if (privkey)
-		ASN1_INTEGER_free(privkey);
-	sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 	DSA_free(dsa);
-	return 0;
+ done:
+    BN_CTX_free(ctx);
+    if (ndsa)
+        sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
+	else
+        ASN1_STRING_clear_free(privkey);
+	return ret;
 	}
 
 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
@@ -701,4 +701,3 @@
 		old_dsa_priv_encode
 		}
 	};
-
Index: openssl-1.0.1i/crypto/asn1/asn1_lib.c
===================================================================
--- openssl-1.0.1i.orig/crypto/asn1/asn1_lib.c	2016-02-24 21:12:27.386569571 +0100
+++ openssl-1.0.1i/crypto/asn1/asn1_lib.c	2016-02-24 21:13:13.822973731 +0100
@@ -446,6 +446,13 @@
 	OPENSSL_free(a);
 	}
 
+void ASN1_STRING_clear_free(ASN1_STRING *a)
+{
+    if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
+        OPENSSL_cleanse(a->data, a->length);
+    ASN1_STRING_free(a);
+}
+
 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 	{
 	int i;

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