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crypto: avoid unitializing ECDH objects on error #34302

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crypto: avoid unitializing ECDH objects on error #34302

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16 changes: 9 additions & 7 deletions src/node_crypto.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -5710,21 +5710,20 @@ void ECDH::SetPrivateKey(const FunctionCallbackInfo<Value>& args) {
return env->ThrowError("Private key is not valid for specified curve.");
}

int result = EC_KEY_set_private_key(ecdh->key_.get(), priv.get());
ECKeyPointer new_key(EC_KEY_dup(ecdh->key_.get()));
CHECK(new_key);

int result = EC_KEY_set_private_key(new_key.get(), priv.get());
priv.reset();

if (!result) {
return env->ThrowError("Failed to convert BN to a private key");
}

// To avoid inconsistency, clear the current public key in-case computing
// the new one fails for some reason.
EC_KEY_set_public_key(ecdh->key_.get(), nullptr);

MarkPopErrorOnReturn mark_pop_error_on_return;
USE(&mark_pop_error_on_return);

const BIGNUM* priv_key = EC_KEY_get0_private_key(ecdh->key_.get());
const BIGNUM* priv_key = EC_KEY_get0_private_key(new_key.get());
CHECK_NOT_NULL(priv_key);

ECPointPointer pub(EC_POINT_new(ecdh->group_));
Expand All @@ -5735,8 +5734,11 @@ void ECDH::SetPrivateKey(const FunctionCallbackInfo<Value>& args) {
return env->ThrowError("Failed to generate ECDH public key");
}

if (!EC_KEY_set_public_key(ecdh->key_.get(), pub.get()))
if (!EC_KEY_set_public_key(new_key.get(), pub.get()))
return env->ThrowError("Failed to set generated public key");

EC_KEY_copy(ecdh->key_.get(), new_key.get());
ecdh->group_ = EC_KEY_get0_group(ecdh->key_.get());
}


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