1 files changed, 10 insertions, 1 deletions

diff --git a/src/lib/libcrypto/asn1/a_int.c b/src/lib/libcrypto/asn1/a_int.c
index 496704b9a5..edb243c021 100644
--- a/src/lib/libcrypto/asn1/a_int.c
+++ b/src/lib/libcrypto/asn1/a_int.c
@@ -397,7 +397,16 @@ ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
         else ret->type=V_ASN1_INTEGER;
         j=BN_num_bits(bn);
         len=((j == 0)?0:((j/8)+1));
-        ret->data=(unsigned char *)OPENSSL_malloc(len+4);
+        if (ret->length < len+4)
+                {
+                unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
+                if (!new_data)
+                        {
+                        ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
+                        goto err;
+                        }
+                ret->data=new_data;
+                }
         ret->length=BN_bn2bin(bn,ret->data);
         /* Correct zero case */
         if(!ret->length)