3 files changed, 18 insertions, 0 deletions

diff --git a/src/lib/libcrypto/dsa/dsa.h b/src/lib/libcrypto/dsa/dsa.h
index 851e3f0445..aa0669eb7a 100644
--- a/src/lib/libcrypto/dsa/dsa.h
+++ b/src/lib/libcrypto/dsa/dsa.h
@@ -79,6 +79,8 @@
 # include <openssl/dh.h>
 #endif
 
+#define OPENSSL_DSA_MAX_MODULUS_BITS    3072
+
 #define DSA_FLAG_CACHE_MONT_P   0x01
 #define DSA_FLAG_NO_EXP_CONSTTIME       0x02 /* new with 0.9.7h; the built-in DSA
                                               * implementation now uses constant time
@@ -259,8 +261,10 @@ void ERR_load_DSA_strings(void);
 #define DSA_F_SIG_CB                                     114
 
 /* Reason codes. */
+#define DSA_R_BAD_Q_VALUE                                102
 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE                100
 #define DSA_R_MISSING_PARAMETERS                         101
+#define DSA_R_MODULUS_TOO_LARGE                          103
 
 #ifdef  __cplusplus
 }
diff --git a/src/lib/libcrypto/dsa/dsa_err.c b/src/lib/libcrypto/dsa/dsa_err.c
index fd42053572..d7fac69154 100644
--- a/src/lib/libcrypto/dsa/dsa_err.c
+++ b/src/lib/libcrypto/dsa/dsa_err.c
@@ -89,8 +89,10 @@ static ERR_STRING_DATA DSA_str_functs[]=
 
 static ERR_STRING_DATA DSA_str_reasons[]=
         {
+{ERR_REASON(DSA_R_BAD_Q_VALUE)           ,"bad q value"},
 {ERR_REASON(DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE),"data too large for key size"},
 {ERR_REASON(DSA_R_MISSING_PARAMETERS)    ,"missing parameters"},
+{ERR_REASON(DSA_R_MODULUS_TOO_LARGE)     ,"modulus too large"},
 {0,NULL}
         };
 
diff --git a/src/lib/libcrypto/dsa/dsa_ossl.c b/src/lib/libcrypto/dsa/dsa_ossl.c
index 12509a7083..5de5fc7e91 100644
--- a/src/lib/libcrypto/dsa/dsa_ossl.c
+++ b/src/lib/libcrypto/dsa/dsa_ossl.c
@@ -274,6 +274,18 @@ static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
                 return -1;
                 }
 
+        if (BN_num_bits(dsa->q) != 160)
+                {
+                DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_BAD_Q_VALUE);
+                return -1;
+                }
+
+        if (BN_num_bits(dsa->p) > OPENSSL_DSA_MAX_MODULUS_BITS)
+                {
+                DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MODULUS_TOO_LARGE);
+                return -1;
+                }
+
         BN_init(&u1);
         BN_init(&u2);
         BN_init(&t1);