Re: [PATCH] server: guest_set_client_capabilities: protect against NULL worker->display_channel

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ACK.

On 12/18/2012 04:57 PM, Uri Lublin wrote:
Reported-by: Michal Luscon <mluscon@xxxxxxxxxx>

Found by a Coverity scan:
   in handle_dev_start -
     Checking "worker->display_channel" implies that "worker->display_channel"
	         might be NULL.
     Passing "worker" to function "guest_set_client_capabilities"
   in guest_set_client_capabilities -
     Directly dereferencing parameter "worker->display_channel"
---
  server/red_worker.c |    3 ++-
  1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/server/red_worker.c b/server/red_worker.c
index 530562b..1f01e3b 100644
--- a/server/red_worker.c
+++ b/server/red_worker.c
@@ -10344,7 +10344,8 @@ static void guest_set_client_capabilities(RedWorker *worker)
          worker->set_client_capabilities_pending = 1;
          return;
      }
-    if (worker->display_channel->common.base.clients_num == 0) {
+    if ((worker->display_channel == NULL) ||
+        (worker->display_channel->common.base.clients_num == 0)) {
          worker->qxl->st->qif->set_client_capabilities(worker->qxl, FALSE, caps);
      } else {
          // Take least common denominator

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