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lsteamclient: Avoid accessing entry->callback.size after free.

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Fixes a crash in Space Engineers.

CW-Bug-Id: #23145
This commit is contained in:
Rémi Bernon 2023-12-18 23:10:19 +01:00 • committed by Arkadiusz Hiler
parent 6858265bd3
commit 37dc6df5eb
1 changed files with 4 additions and 4 deletions
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8
lsteamclient/unixlib.cpp
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@ -231,6 +231,7 @@ NTSTATUS ISteamClient_SteamClient020_Set_SteamAPI_CCheckCallbackRegisteredInProc
NTSTATUS steamclient_next_callback( void *args )
{
struct steamclient_next_callback_params *params = (struct steamclient_next_callback_params *)args;
uint32_t capacity = params->size;
struct list *ptr;
pthread_mutex_lock( &callbacks_lock );
@ -238,14 +239,13 @@ NTSTATUS steamclient_next_callback( void *args )
{
struct callback_entry *entry = LIST_ENTRY( ptr, struct callback_entry, entry );
if (entry->callback.size <= params->size)
params->size = entry->callback.size;
if (params->size <= capacity)
{
memcpy( params->callback, &entry->callback, entry->callback.size );
memcpy( params->callback, &entry->callback, params->size );
list_remove( &entry->entry );
free( entry );
}
params->size = entry->callback.size;
}
pthread_mutex_unlock( &callbacks_lock );