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noux: avoid dangling pointer

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Issue #485
This commit is contained in:
Alexander Boettcher 2013-08-28 14:47:08 +02:00 committed by Norman Feske
parent 78c8145d9b
commit bbb9c6daec
2 changed files with 21 additions and 23 deletions
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2
ports/src/noux/dataspace_registry.h
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@ -73,6 +73,8 @@ namespace Noux {
user = _users.first();
if (!user)
break;
_users.remove(user);
}
user->dissolve(*this);
}

42
ports/src/noux/rm_session_component.h
View File

@ -218,17 +218,18 @@ namespace Noux {
Region(*this, ds, size, offset, local_addr);
/* register region as user of RAM dataspaces */
Object_pool<Dataspace_info>::Guard info(_ds_registry.lookup_info(ds));
{
Object_pool<Dataspace_info>::Guard info(_ds_registry.lookup_info(ds));
if (info) {
info->register_user(*region);
} else {
if (verbose_attach) {
PWRN("Trying to attach unknown dataspace type");
PWRN(" ds_info@%p at 0x%lx size=%zd offset=0x%lx",
info.object(), (long)local_addr,
Dataspace_client(ds).size(), (long)offset);
if (info) {
info->register_user(*region);
} else {
if (verbose_attach) {
PWRN("Trying to attach unknown dataspace type");
PWRN(" ds_info@%p at 0x%lx size=%zd offset=0x%lx",
info.object(), (long)local_addr,
Dataspace_client(ds).size(), (long)offset);
}
}
}
@ -244,8 +245,6 @@ namespace Noux {
void detach(Local_addr local_addr)
{
_rm.detach(local_addr);
Region *region = _lookup_region_by_addr(local_addr);
if (!region) {
PWRN("Attempt to detach unknown region at 0x%p",
@ -255,11 +254,16 @@ namespace Noux {
_regions.remove(region);
Object_pool<Dataspace_info>::Guard info(_ds_registry.lookup_info(region->ds));
if (info)
info->unregister_user(*region);
{
Object_pool<Dataspace_info>::Guard info(_ds_registry.lookup_info(region->ds));
if (info)
info->unregister_user(*region);
}
destroy(env()->heap(), region);
_rm.detach(local_addr);
}
Pager_capability add_client(Thread_capability thread)
@ -291,15 +295,7 @@ namespace Noux {
inline void Rm_session_component::Region::dissolve(Dataspace_info &ds)
{
/*
* When this function is called, the 'ds' is already locked by the
* caller. To prevent 'detach' from taking the lock twice
* ('_ds_registry.lookup_info'), the temporarily release and re-acquire
* the lock.
*/
ds.release();
rm.detach(local_addr);
ds.acquire();
}
}