Re: [PATCH] worker: improve validation for update command

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On 11/26/2015 03:15 PM, Pavel Grunt wrote:
On Thu, 2015-11-26 at 12:26 +0000, Frediano Ziglio wrote:
If surface_id is not valid we should still release resource allocated
by red_get_update_cmd and from the guest.
This to reduce leaks in case of a race or another error in the guest
driver.
Also not issue a warning on invalid surface number to avoid filling
log space unconditionally.

Hi Frediano,

The patch looks good to me.

However I think the code should issue a warning.
Maybe we need to think of a mechanism to limit the number of such
warnings.

Thanks,
    Uri.


Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
  server/red_worker.c | 8 +++-----
  1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/server/red_worker.c b/server/red_worker.c
index 678b581..229ffe9 100644
--- a/server/red_worker.c
+++ b/server/red_worker.c
@@ -877,12 +877,10 @@ static int red_process_commands(RedWorker *worker,
uint32_t max_pipe_size, int *
                                     &update, ext_cmd.cmd.data)) {
                  break;
              }
-            if (!validate_surface(worker->display_channel,
update.surface_id)) {
-                spice_warning("Invalid surface in QXL_CMD_UPDATE");
-                break;
+            if (validate_surface(worker->display_channel, update.surface_id))
{
+                display_channel_draw(worker->display_channel, &update.area,
update.surface_id);
+                worker->qxl->st->qif->notify_update(worker->qxl,
update.update_id);
              }
-            display_channel_draw(worker->display_channel, &update.area,
update.surface_id);
-            worker->qxl->st->qif->notify_update(worker->qxl,
update.update_id);
              release_info_ext.group_id = ext_cmd.group_id;
              release_info_ext.info = update.release_info;
              worker->qxl->st->qif->release_resource(worker->qxl,
release_info_ext);

Acked-by: Pavel Grunt <pgrunt@xxxxxxxxxx>

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