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mux: fix race condition of notification oid conversion

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Signed-off-by: Wataru Ishida <ishida@nel-america.com>
This commit is contained in:
Wataru Ishida
2019-06-11 15:21:36 -07:00
committed by Wataru Ishida
parent db57d98ff5
commit 318f221930
2 changed files with 27 additions and 8 deletions
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26
tai_mux/mux.cpp
View File

@@ -247,7 +247,6 @@ void Multiplexier::notify(notification_context* ctx, tai_object_id_t real_oid, t
if ( oid == TAI_NULL_OBJECT_ID ) {
return;
}
auto key = std::pair<tai_object_id_t, tai_attr_id_t>(oid, ctx->notify_id);
tai_attribute_t dst;
tai_alloc_info_t info;
info.reference = src;
@@ -272,7 +271,10 @@ void Multiplexier::notify(notification_context* ctx, tai_object_id_t real_oid, t
goto err;
}
ctx->handler.notify(ctx->handler.context, oid, &dst);
{
std::unique_lock<std::mutex> lk(ctx->mutex);
ctx->handler.notify(ctx->handler.context, oid, &dst);
}
err:
tai_metadata_free_attr_value(meta, &dst, nullptr);
}
@@ -292,6 +294,7 @@ tai_status_t Multiplexier::set_attributes( std::function<tai_status_t(ModuleAdap
std::vector<tai_attribute_t> attrs;
tai_alloc_info_t info;
auto t = object_type_query(oid);
std::vector<notification_key> n_to_clear;
for ( auto i = 0; i < attr_count; i++ ) {
auto meta = tai_metadata_get_attr_metadata(t, attr_list[i].id);
if ( meta == nullptr ) {
@@ -312,8 +315,19 @@ tai_status_t Multiplexier::set_attributes( std::function<tai_status_t(ModuleAdap
goto err;
}
attrs.emplace_back(attr);
// we can't delete m_notification_map[key] before calling f() since
// the adapter can still call the notification callback.
// store the keys to be removed into n_to_clear and delete them after calling f()
if ( meta->attrvaluetype == TAI_ATTR_VALUE_TYPE_NOTIFICATION && attr.value.notification.notify == nullptr ) {
n_to_clear.emplace_back(notification_key(oid, attr.id));
}
}
ret = f(m_adapter, id, attrs.size(), attrs.data());
for ( auto& key : n_to_clear ) {
delete m_notification_map[key];
m_notification_map.erase(key);
}
err:
if ( free_attributes(t, attrs) < 0 ) {
return TAI_STATUS_FAILURE;
@@ -365,7 +379,7 @@ tai_status_t Multiplexier::convert_oid(tai_object_id_t oid, const tai_attribute_
}
return oid;
};
auto key = std::pair<tai_object_id_t, tai_attr_id_t>(oid, src->id);
auto key = notification_key(oid, src->id);
switch (meta->attrvaluetype) {
case TAI_ATTR_VALUE_TYPE_OID:
@@ -405,14 +419,12 @@ tai_status_t Multiplexier::convert_oid(tai_object_id_t oid, const tai_attribute_
dst->value.notification.notify = n->handler.notify;
}
} else {
if ( src->value.notification.notify == nullptr ) {
delete m_notification_map[key];
m_notification_map.erase(key);
} else {
if ( src->value.notification.notify != nullptr ) {
if ( m_notification_map.find(key) == m_notification_map.end() ) {
m_notification_map[key] = new notification_context();
}
auto n = m_notification_map[key];
std::unique_lock<std::mutex> lk(n->mutex);
n->mux = this;
n->adapter = adapter;
n->handler = src->value.notification;

9
tai_mux/mux.hpp
View File

@@ -9,6 +9,7 @@
#include "tai.h"
#include <sstream>
#include <bitset>
#include <mutex>
class OIDAllocator {
public:
@@ -36,8 +37,11 @@ struct notification_context {
ModuleAdapter* adapter;
tai_notification_handler_t handler;
tai_attr_id_t notify_id;
std::mutex mutex;
};
using notification_key = std::pair<tai_object_id_t, tai_attr_id_t>;
// singleton
class Multiplexier {
public:
@@ -57,6 +61,9 @@ class Multiplexier {
if ( m_pa != nullptr ) {
delete m_pa;
}
for ( auto& n : m_notification_map ) {
delete n.second;
}
}
ModuleAdapter * get_module_adapter(const std::string& location) {
@@ -133,7 +140,7 @@ class Multiplexier {
void operator = (const Multiplexier&){}
PlatformAdapter *m_pa;
std::map<tai_object_id_t, std::pair<tai_object_id_t, ModuleAdapter* >> m_map;
std::map<std::pair<tai_object_id_t, tai_attr_id_t>, notification_context*> m_notification_map;
std::map<notification_key, notification_context*> m_notification_map;
OIDAllocator m_oid_allocator;