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Fix dsa_pub_encode

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The return value from ASN1_STRING_new() was not being checked which could
lead to a NULL deref in the event of a malloc failure. Also fixed a mem
leak in the error path.

Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Matt Caswell
2015-03-11 20:19:08 +00:00
parent 6aa8dab2bb
commit 0c7ca4033d
1 changed files with 8 additions and 6 deletions
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14
crypto/dsa/dsa_ameth.c
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@@ -129,21 +129,23 @@ static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DSA *dsa;
void *pval = NULL;
int ptype;
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str = NULL;
dsa = pkey->pkey.dsa;
if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
ASN1_STRING *str;
str = ASN1_STRING_new();
if (!str) {
DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
str->length = i2d_DSAparams(dsa, &str->data);
if (str->length <= 0) {
DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
goto err;
}
pval = str;
ptype = V_ASN1_SEQUENCE;
} else
ptype = V_ASN1_UNDEF;
@@ -158,14 +160,14 @@ static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
ptype, pval, penc, penclen))
ptype, str, penc, penclen))
return 1;
err:
if (penc)
OPENSSL_free(penc);
if (pval)
ASN1_STRING_free(pval);
if (str)
ASN1_STRING_free(str);
return 0;
}