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move check to avoid memory leak.

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This commit is contained in:
Ulf Möller 2001-06-06 17:23:23 +00:00
parent ee8aa8217a
commit 8ca2ae775d
1 changed files with 8 additions and 8 deletions
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16
crypto/rsa/rsa_oaep.c
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@ -102,6 +102,14 @@ int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
return (-1);
}
lzero = num - flen;
if (lzero < 0)
{
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
return (-1);
}
maskeddb = from - lzero + SHA_DIGEST_LENGTH;
dblen = num - SHA_DIGEST_LENGTH;
db = OPENSSL_malloc(dblen);
if (db == NULL)
@ -110,14 +118,6 @@ int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
return (-1);
}
lzero = num - flen;
if (lzero < 0)
{
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
return (-1);
}
maskeddb = from - lzero + SHA_DIGEST_LENGTH;
MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
seed[i] ^= from[i - lzero];