3 files changed, 12 insertions, 0 deletions
diff --git a/crypto/dsa/dsa.h b/crypto/dsa/dsa.h
index 65689a3426..12b60a8faa 100644
--- a/crypto/dsa/dsa.h
+++ b/crypto/dsa/dsa.h
@@ -248,6 +248,7 @@ DH *DSA_dup_DH(DSA *r);
 
 /* Reason codes. */
 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE		 100
+#define DSA_R_MISSING_PARAMETERS			 101
 
 #ifdef  __cplusplus
 }
diff --git a/crypto/dsa/dsa_err.c b/crypto/dsa/dsa_err.c
index 2b3ab3a9ad..736aeef7c4 100644
--- a/crypto/dsa/dsa_err.c
+++ b/crypto/dsa/dsa_err.c
@@ -85,6 +85,7 @@ static ERR_STRING_DATA DSA_str_functs[]=
 static ERR_STRING_DATA DSA_str_reasons[]=
 	{
 {DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE       ,"data too large for key size"},
+{DSA_R_MISSING_PARAMETERS                ,"missing parameters"},
 {0,NULL}
 	};
 
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
index 72878e193f..0ee172dd07 100644
--- a/crypto/dsa/dsa_ossl.c
+++ b/crypto/dsa/dsa_ossl.c
@@ -106,6 +106,11 @@ static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
 	int i,reason=ERR_R_BN_LIB;
 	DSA_SIG *ret=NULL;
 
+	if (!dsa->p || !dsa->q || !dsa->g)
+		{
+		reason=DSA_R_MISSING_PARAMETERS;
+		goto err;
+		}
 	BN_init(&m);
 	BN_init(&xr);
 	s=BN_new();
@@ -168,6 +173,11 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
 	BIGNUM k,*kinv=NULL,*r=NULL;
 	int ret=0;
 
+	if (!dsa->p || !dsa->q || !dsa->g)
+		{
+		DSAerr(DSA_F_DSA_SIGN_SETUP,DSA_R_MISSING_PARAMETERS);
+		return 0;
+		}
 	if (ctx_in == NULL)
 		{
 		if ((ctx=BN_CTX_new()) == NULL) goto err;