Re: [PATCH spice-server 2/2] char device: Ensure public function parameters are not NULL

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Hi Fabiano,

On Thu, 2015-11-05 at 23:24 +0100, Fabiano Fidêncio wrote:
> On Thu, Nov 5, 2015 at 4:58 PM, Pavel Grunt <pgrunt@xxxxxxxxxx> wrote:
> > ---
> >  server/char_device.c | 47 ++++++++++++++++++++++++++++++++++++++++++++---
> >  server/reds.c        |  2 ++
> >  server/spicevmc.c    |  6 ++++++
> >  3 files changed, 52 insertions(+), 3 deletions(-)
> > 
> > diff --git a/server/char_device.c b/server/char_device.c
> > index 54357f0..00ed4d9 100644
> > --- a/server/char_device.c
> > +++ b/server/char_device.c
> > @@ -376,6 +376,9 @@ void
> > spice_char_device_send_to_client_tokens_add(SpiceCharDeviceState *dev,
> >  {
> >      SpiceCharDeviceClientState *dev_client;
> > 
> > +    spice_return_if_fail(dev != NULL);
> > +    spice_return_if_fail(client != NULL);
> > +
> >      dev_client = spice_char_device_client_find(dev, client);
> > 
> >      if (!dev_client) {
> > @@ -391,6 +394,9 @@ void
> > spice_char_device_send_to_client_tokens_set(SpiceCharDeviceState *dev,
> >  {
> >      SpiceCharDeviceClientState *dev_client;
> > 
> > +    spice_return_if_fail(dev != NULL);
> > +    spice_return_if_fail(client != NULL);
> > +
> >      dev_client = spice_char_device_client_find(dev, client);
> > 
> >      if (!dev_client) {
> > @@ -573,6 +579,8 @@ SpiceCharDeviceWriteBuffer
> > *spice_char_device_write_buffer_get(SpiceCharDeviceSt
> >                                                                 RedClient
> > *client,
> >                                                                 int size)
> >  {
> > +    spice_return_val_if_fail(dev != NULL, NULL);
> > +
> >     return  __spice_char_device_write_buffer_get(dev, client, size,
> >               client ? WRITE_BUFFER_ORIGIN_CLIENT :
> > WRITE_BUFFER_ORIGIN_SERVER,
> >               0);
> > @@ -581,6 +589,8 @@ SpiceCharDeviceWriteBuffer
> > *spice_char_device_write_buffer_get(SpiceCharDeviceSt
> >  SpiceCharDeviceWriteBuffer
> > *spice_char_device_write_buffer_get_server_no_token(
> >      SpiceCharDeviceState *dev, int size)
> >  {
> > +    spice_return_val_if_fail(dev != NULL, NULL);
> > +
> >     return  __spice_char_device_write_buffer_get(dev, NULL, size,
> >               WRITE_BUFFER_ORIGIN_SERVER_NO_TOKEN, 0);
> >  }
> > @@ -597,6 +607,7 @@ void
> > spice_char_device_write_buffer_add(SpiceCharDeviceState *dev,
> >                                          SpiceCharDeviceWriteBuffer
> > *write_buf)
> >  {
> >      spice_assert(dev);
> > +    spice_return_if_fail(write_buf != NULL);
> >      /* caller shouldn't add buffers for client that was removed */
> >      if (write_buf->origin == WRITE_BUFFER_ORIGIN_CLIENT &&
> >          !spice_char_device_client_find(dev, write_buf->client)) {
> > @@ -612,9 +623,15 @@ void
> > spice_char_device_write_buffer_add(SpiceCharDeviceState *dev,
> >  void spice_char_device_write_buffer_release(SpiceCharDeviceState *dev,
> >                                              SpiceCharDeviceWriteBuffer
> > *write_buf)
> >  {
> > -    int buf_origin = write_buf->origin;
> > -    uint32_t buf_token_price = write_buf->token_price;
> > -    RedClient *client = write_buf->client;
> > +    int buf_origin;
> > +    uint32_t buf_token_price;
> > +    RedClient *client;
> > +
> > +    spice_return_if_fail(write_buf != NULL);
> > +
> > +    buf_origin = write_buf->origin;
> > +    buf_token_price = write_buf->token_price;
> > +    client = write_buf->client;
> > 
> >      spice_assert(!ring_item_is_linked(&write_buf->link));
> >      if (!dev) {
> > @@ -690,6 +707,8 @@ SpiceCharDeviceState
> > *spice_char_device_state_create(SpiceCharDeviceInstance *si
> >  void spice_char_device_state_reset_dev_instance(SpiceCharDeviceState
> > *state,
> >                                                  SpiceCharDeviceInstance
> > *sin)
> >  {
> > +    spice_return_if_fail(state != NULL);
> > +    spice_return_if_fail(sin != NULL);
> >      spice_debug("sin %p dev_state %p", sin, state);
> >      state->sin = sin;
> >      sin->st = state;
> > @@ -697,6 +716,7 @@ void
> > spice_char_device_state_reset_dev_instance(SpiceCharDeviceState *state,
> > 
> >  void *spice_char_device_state_opaque_get(SpiceCharDeviceState *dev)
> >  {
> > +    spice_return_val_if_fail(dev != NULL, NULL);
> >      return dev->opaque;
> >  }
> > 
> > @@ -721,6 +741,8 @@ static void
> > spice_char_device_state_unref(SpiceCharDeviceState *char_dev)
> > 
> >  void spice_char_device_state_destroy(SpiceCharDeviceState *char_dev)
> >  {
> > +    spice_return_if_fail(char_dev != NULL);
> > +
> >      reds_on_char_device_state_destroy(char_dev);
> >      if (char_dev->write_to_dev_timer) {
> >          core->timer_remove(char_dev->write_to_dev_timer);
> > @@ -796,6 +818,9 @@ void
> > spice_char_device_client_remove(SpiceCharDeviceState *dev,
> >  {
> >      SpiceCharDeviceClientState *dev_client;
> > 
> > +    spice_return_if_fail(dev != NULL);
> > +    spice_return_if_fail(client != NULL);
> > +
> >      spice_debug("dev_state %p client %p", dev, client);
> >      dev_client = spice_char_device_client_find(dev, client);
> > 
> > @@ -814,11 +839,16 @@ void
> > spice_char_device_client_remove(SpiceCharDeviceState *dev,
> >  int spice_char_device_client_exists(SpiceCharDeviceState *dev,
> >                                      RedClient *client)
> >  {
> > +    spice_return_val_if_fail(dev != NULL, FALSE);
> > +    spice_return_val_if_fail(client != NULL, FALSE);
> > +
> >      return (spice_char_device_client_find(dev, client) != NULL);
> >  }
> > 
> >  void spice_char_device_start(SpiceCharDeviceState *dev)
> >  {
> > +    spice_return_if_fail(dev != NULL);
> > +
> >      spice_debug("dev_state %p", dev);
> >      dev->running = TRUE;
> >      spice_char_device_state_ref(dev);
> > @@ -829,6 +859,8 @@ void spice_char_device_start(SpiceCharDeviceState *dev)
> > 
> >  void spice_char_device_stop(SpiceCharDeviceState *dev)
> >  {
> > +    spice_return_if_fail(dev != NULL);
> > +
> >      spice_debug("dev_state %p", dev);
> >      dev->running = FALSE;
> >      dev->active = FALSE;
> > @@ -841,6 +873,8 @@ void spice_char_device_reset(SpiceCharDeviceState *dev)
> >  {
> >      RingItem *client_item;
> > 
> > +    spice_return_if_fail(dev != NULL);
> > +
> >      spice_char_device_stop(dev);
> >      dev->wait_for_migrate_data = FALSE;
> >      spice_debug("dev_state %p", dev);
> > @@ -871,6 +905,8 @@ void spice_char_device_reset(SpiceCharDeviceState *dev)
> > 
> >  void spice_char_device_wakeup(SpiceCharDeviceState *dev)
> >  {
> > +    spice_return_if_fail(dev != NULL);
> > +
> >      spice_char_device_write_to_device(dev);
> >      spice_char_device_read_from_device(dev);
> >  }
> > @@ -883,6 +919,7 @@ void
> > spice_char_device_state_migrate_data_marshall_empty(SpiceMarshaller *m)
> >  {
> >      SpiceMigrateDataCharDevice *mig_data;
> > 
> > +    spice_return_if_fail(m != NULL);
> >      spice_debug(NULL);
> >      mig_data = (SpiceMigrateDataCharDevice
> > *)spice_marshaller_reserve_space(m,
> >                                                                             
> >  sizeof(*mig_data));
> > @@ -907,6 +944,8 @@ void
> > spice_char_device_state_migrate_data_marshall(SpiceCharDeviceState *dev,
> >      uint32_t *write_to_dev_tokens_ptr;
> >      SpiceMarshaller *m2;
> > 
> > +    spice_return_if_fail(dev != NULL);
> > +    spice_return_if_fail(m != NULL);
> >      /* multi-clients are not supported */
> >      spice_assert(dev->num_clients == 1);
> >      client_state = SPICE_CONTAINEROF(ring_get_tail(&dev->clients),
> > @@ -964,6 +1003,8 @@ int
> > spice_char_device_state_restore(SpiceCharDeviceState *dev,
> >      SpiceCharDeviceClientState *client_state;
> >      uint32_t client_tokens_window;
> > 
> > +    spice_return_val_if_fail(dev != NULL, FALSE);
> > +    spice_return_val_if_fail(mig_data != NULL, FALSE);
> >      spice_assert(dev->num_clients == 1 && dev->wait_for_migrate_data);
> > 
> >      client_state = SPICE_CONTAINEROF(ring_get_tail(&dev->clients),
> > diff --git a/server/reds.c b/server/reds.c
> > index 1f6774e..4d18ca8 100644
> > --- a/server/reds.c
> > +++ b/server/reds.c
> > @@ -2983,6 +2983,8 @@ static SpiceCharDeviceState
> > *attach_to_red_agent(SpiceCharDeviceInstance *sin)
> > 
> >  SPICE_GNUC_VISIBLE void
> > spice_server_char_device_wakeup(SpiceCharDeviceInstance* sin)
> >  {
> > +    spice_return_if_fail(sin != NULL);
> > +
> 
> Hmm. Just a minor, but maybe would worth to use spice_return_if_fail()
> for sin->st as well.
> 
spice_return_*if_fail() aborts, and I wanted to avoid it, that is the reason why
I used spice_warning() & return in the first patch.
                    
Pavel

> >      if (!sin->st) {
> >          spice_warning("no SpiceCharDeviceState attached to instance %p",
> > sin);
> >          return;
> > diff --git a/server/spicevmc.c b/server/spicevmc.c
> > index 6ac1561..0780192 100644
> > --- a/server/spicevmc.c
> > +++ b/server/spicevmc.c
> > @@ -508,6 +508,8 @@ SpiceCharDeviceState
> > *spicevmc_device_connect(SpiceCharDeviceInstance *sin,
> >      ClientCbs client_cbs = { NULL, };
> >      SpiceCharDeviceCallbacks char_dev_cbs = {NULL, };
> > 
> > +    spice_return_val_if_fail(sin != NULL, NULL);
> > +
> >      channel_cbs.config_socket = spicevmc_red_channel_client_config_socket;
> >      channel_cbs.on_disconnect = spicevmc_red_channel_client_on_disconnect;
> >      channel_cbs.send_item = spicevmc_red_channel_send_item;
> > @@ -552,6 +554,8 @@ void spicevmc_device_disconnect(SpiceCharDeviceInstance
> > *sin)
> >  {
> >      SpiceVmcState *state;
> > 
> > +    spice_return_if_fail(sin != NULL);
> > +
> >      state = (SpiceVmcState *)spice_char_device_state_opaque_get(sin->st);
> > 
> >      if (state->recv_from_client_buf) {
> > @@ -569,6 +573,8 @@ SPICE_GNUC_VISIBLE void
> > spice_server_port_event(SpiceCharDeviceInstance *sin, ui
> >  {
> >      SpiceVmcState *state;
> > 
> > +    spice_return_if_fail(sin != NULL);
> > +
> 
> Same here ...
> 
> >      if (sin->st == NULL) {
> >          spice_warning("no SpiceCharDeviceState attached to instance %p",
> > sin);
> >          return;
> > --
> > 2.5.0
> > 
> > _______________________________________________
> > Spice-devel mailing list
> > Spice-devel@xxxxxxxxxxxxxxxxxxxxx
> > http://lists.freedesktop.org/mailman/listinfo/spice-devel
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