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Merge "Usage Table Failure Creates Broken CryptoSession"

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This commit is contained in:
John Bruce
2019-10-02 18:19:51 +00:00
committed by Android (Google) Code Review
parent 48b2622017 d7b17c469b
commit 78e84dcd3b
1 changed files with 23 additions and 3 deletions
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26
libwvdrmengine/cdm/core/src/crypto_session.cpp
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@@ -674,6 +674,7 @@ CdmResponseType CryptoSession::Open(SecurityLevel requested_security_level) {
return LOAD_SYSTEM_ID_ERROR;
}
// Set up request ID
uint64_t request_id_base;
OEMCryptoResult random_sts;
WithOecReadLock("Open() calling OEMCrypto_GetRandom", [&] {
@@ -688,6 +689,22 @@ CdmResponseType CryptoSession::Open(SecurityLevel requested_security_level) {
HexEncode(reinterpret_cast<uint8_t*>(&request_id_index),
sizeof(request_id_index));
// Initialize key session
WithOecSessionLock("Open() calling key_session_.reset()", [&] {
key_session_.reset(new ContentKeySession(oec_session_id_, metrics_));
});
// Set up Usage Table support
//
// This MUST be the last thing in the function because it contains the
// successful return paths of the function. It will attempt to initialize
// usage tables. However, whether they are employed is determined by
// information in the license, which will not be received until later. In case
// usage tables are not even needed, initialization errors here are ignored by
// returning successfully.
//
// TODO(b/141350978): Refactor this code so that it does not have this
// problem.
if (!GetApiVersion(&api_version_)) {
LOGE("Failed to get API version");
return USAGE_SUPPORT_GET_API_FAILED;
@@ -735,9 +752,12 @@ CdmResponseType CryptoSession::Open(SecurityLevel requested_security_level) {
metrics_->oemcrypto_usage_table_support_.SetError(result);
}
WithOecSessionLock("Open() calling key_session_.reset()", [&] {
key_session_.reset(new ContentKeySession(oec_session_id_, metrics_));
});
// Do not add logic after this point as it may never get exercised. In the
// event of errors initializing the usage tables, the code will return early,
// never reaching this point. See the comment above the "Set up Usage Table
// support" section for details.
//
// TODO(b/139973602): Refactor this code.
return NO_ERROR;
}