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Fixed crash if there are multiple joysticks closed during the joystick update loop

This commit is contained in:
Sam Lantinga 2016-12-14 06:25:09 -08:00
parent f50a04009c
commit b4ea63ec2c
1 changed files with 12 additions and 15 deletions
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21
src/joystick/SDL_joystick.c
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@ -34,7 +34,7 @@
static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
static SDL_Joystick *SDL_joysticks = NULL;
static SDL_Joystick *SDL_updating_joystick = NULL;
static SDL_bool SDL_updating_joystick = SDL_FALSE;
static SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */
void
@ -458,7 +458,7 @@ SDL_JoystickClose(SDL_Joystick * joystick)
return;
}
if (joystick == SDL_updating_joystick) {
if (SDL_updating_joystick) {
SDL_UnlockJoystickList();
return;
}
@ -784,7 +784,7 @@ SDL_PrivateJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
void
SDL_JoystickUpdate(void)
{
SDL_Joystick *joystick, *joysticknext;
SDL_Joystick *joystick;
SDL_LockJoystickList();
@ -794,17 +794,12 @@ SDL_JoystickUpdate(void)
return;
}
for (joystick = SDL_joysticks; joystick; joystick = joysticknext) {
/* save off the next pointer, the Update call may cause a joystick removed event
* and cause our joystick pointer to be freed
*/
joysticknext = joystick->next;
SDL_updating_joystick = joystick;
SDL_updating_joystick = SDL_TRUE;
/* Make sure the list is unlocked while dispatching events to prevent application deadlocks */
SDL_UnlockJoystickList();
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
SDL_SYS_JoystickUpdate(joystick);
if (joystick->force_recentering) {
@ -825,12 +820,14 @@ SDL_JoystickUpdate(void)
joystick->force_recentering = SDL_FALSE;
}
}
SDL_LockJoystickList();
SDL_updating_joystick = NULL;
SDL_updating_joystick = SDL_FALSE;
/* If the joystick was closed while updating, free it here */
/* If any joysticks were closed while updating, free them here */
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
if (joystick->ref_count <= 0) {
SDL_JoystickClose(joystick);
}