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Fix pointer use after free bug

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If toxcore fails to end a call we still need to do a cleanup
This commit is contained in:
jfreegman 2020-10-27 15:20:21 -04:00
parent 478762f76c
commit 91f194c821
No known key found for this signature in database
GPG Key ID: 3627F3144076AE63
3 changed files with 36 additions and 34 deletions
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55
src/audio_call.c
View File

@ -111,6 +111,8 @@ void callback_call_ended(uint32_t friend_number);
void write_device_callback(uint32_t friend_number, const int16_t *PCM, uint16_t sample_count, uint8_t channels,
uint32_t sample_rate);
static int stop_transmission(Call *call, uint32_t friend_number, bool set_call_control);
static void print_err(ToxWindow *self, const char *error_str)
{
line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "%s", error_str);
@ -160,10 +162,8 @@ ToxAV *init_audio(ToxWindow *self, Tox *tox)
void terminate_audio(void)
{
int i;
for (i = 0; i < CallControl.max_calls; ++i) {
stop_transmission(&CallControl.calls[i], i);
for (size_t i = 0; i < CallControl.max_calls; ++i) {
stop_transmission(&CallControl.calls[i], i, true);
}
if (CallControl.av) {
@ -237,33 +237,38 @@ int start_transmission(ToxWindow *self, Call *call)
return 0;
}
int stop_transmission(Call *call, uint32_t friend_number)
/*
* Stops call transmission.
*
* `set_call_control` should be set to false if we already called toxav_call_control() with TOXAV_CALL_CONTROL_CANCEL.
*/
static int stop_transmission(Call *call, uint32_t friend_number, bool set_call_control)
{
if (call->ttas) {
Toxav_Err_Call_Control error = TOXAV_ERR_CALL_CONTROL_OK;
if (CallControl.call_state > TOXAV_FRIEND_CALL_STATE_FINISHED) {
if (set_call_control && CallControl.call_state > TOXAV_FRIEND_CALL_STATE_FINISHED) {
toxav_call_control(CallControl.av, friend_number, TOXAV_CALL_CONTROL_CANCEL, &error);
}
call->ttas = false;
if (call->in_idx != -1) {
close_device(input, call->in_idx);
}
if (call->out_idx != -1) {
close_device(output, call->out_idx);
}
if (set_call(call, false) == -1) {
return -1;
}
if (error == TOXAV_ERR_CALL_CONTROL_OK) {
call->ttas = false;
if (call->in_idx != -1) {
close_device(input, call->in_idx);
}
if (call->out_idx != -1) {
close_device(output, call->out_idx);
}
if (set_call(call, false) == -1) {
return -1;
}
return 0;
} else {
fprintf(stderr, "failed to stop transmission. ToxAV error: %d\n", error);
return -1;
}
}
@ -306,8 +311,7 @@ void on_call_state(ToxAV *av, uint32_t friend_number, uint32_t state, void *user
#ifdef VIDEO
callback_video_end(friend_number);
#endif /* VIDEO */
stop_transmission(&CallControl.calls[friend_number], friend_number);
stop_transmission(&CallControl.calls[friend_number], friend_number, true);
callback_call_ended(friend_number);
CallControl.pending_call = false;
@ -324,8 +328,7 @@ void on_call_state(ToxAV *av, uint32_t friend_number, uint32_t state, void *user
callback_recv_video_end(friend_number);
callback_video_end(friend_number);
#endif /* VIDEO */
stop_transmission(&CallControl.calls[friend_number], friend_number);
stop_transmission(&CallControl.calls[friend_number], friend_number, true);
/* Reset stored call state after finishing */
CallControl.call_state = 0;
@ -971,7 +974,7 @@ void stop_current_call(ToxWindow *self)
if (CallControl.pending_call) {
callback_call_canceled(self->num);
} else {
stop_transmission(&CallControl.calls[self->num], self->num);
stop_transmission(&CallControl.calls[self->num], self->num, false);
callback_call_ended(self->num);
}

1
src/audio_call.h
View File

@ -87,7 +87,6 @@ extern struct CallControl CallControl;
ToxAV *init_audio(ToxWindow *self, Tox *tox);
void terminate_audio(void);
int start_transmission(ToxWindow *self, Call *call);
int stop_transmission(Call *call, uint32_t friend_number);
void stop_current_call(ToxWindow *self);
void init_friend_AV(uint32_t index);
void del_friend_AV(uint32_t index);

14
src/audio_device.c
View File

@ -342,6 +342,7 @@ DeviceError close_device(DeviceType type, uint32_t device_idx)
}
lock;
Device *device = running[type][device_idx];
DeviceError rc = de_None;
@ -472,6 +473,7 @@ void *thread_poll(void *arg) // TODO: maybe use thread for every input source
lock;
if (!thread_running) {
free(frame_buf);
unlock;
break;
}
@ -488,18 +490,18 @@ void *thread_poll(void *arg) // TODO: maybe use thread for every input source
for (uint32_t i = 0; i < size[input]; ++i) {
lock;
if (running[input][i] != NULL) {
alcGetIntegerv(running[input][i]->dhndl, ALC_CAPTURE_SAMPLES, sizeof(int32_t), &sample);
Device *device = running[input][i];
int f_size = (running[input][i]->sample_rate * running[input][i]->frame_duration / 1000);
if (device != NULL) {
alcGetIntegerv(device->dhndl, ALC_CAPTURE_SAMPLES, sizeof(int32_t), &sample);
int f_size = (device->sample_rate * device->frame_duration / 1000);
if (sample < f_size || f_size > FRAME_BUF_SIZE) {
unlock;
continue;
}
Device *device = running[input][i];
alcCaptureSamples(device->dhndl, frame_buf, f_size);
if (device->muted) {
@ -519,8 +521,6 @@ void *thread_poll(void *arg) // TODO: maybe use thread for every input source
}
}
free(frame_buf);
pthread_exit(NULL);
}