check BN_copy() return value

diff --git a/crypto/bn/bn_blind.c b/crypto/bn/bn_blind.c
index 40e742dbadd64e178c419684729bd91fafe2a8d6..ca22d4f8bdcb075e8deba9ebe2d44336937999cf 100644 (file)
--- a/crypto/bn/bn_blind.c
+++ b/crypto/bn/bn_blind.c
@@ -207,6 +207,8 @@ int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
 
 int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
        {
+       int ret = 1;
+
        bn_check_top(n);
 
        if ((b->A == NULL) || (b->Ai == NULL))
@@ -216,9 +218,13 @@ int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
                }
 
        if (r != NULL)
-               BN_copy(r, b->Ai);
+               {
+               if (!BN_copy(r, b->Ai)) ret=0;
+               }
 
-       return BN_mod_mul(n,n,b->A,b->mod,ctx);
+       if (!BN_mod_mul(n,n,b->A,b->mod,ctx)) ret=0;
+       
+       return ret;
        }
 
 int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
@@ -351,4 +357,3 @@ err:
 
        return ret;
 }
-