[PATCH] wayland-server: Fix null pointer dereferencing

[Ashim]

Initialising 'wl_client *client = NULL' and checking 'resource' for NULL and returning if found.
This patch will avoid dereferencing of 'resource' if NULL

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=91356

Signed-off-by: Ashim <ashim.shah at samsung.com>
---
 src/wayland-server.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wayland-server.c b/src/wayland-server.c
index 0f04f66..2a0d19c 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -207,7 +207,7 @@ WL_EXPORT void
 wl_resource_post_error(struct wl_resource *resource,
 		       uint32_t code, const char *msg, ...)
 {
-	struct wl_client *client = resource->client;
+	struct wl_client *client = NULL;
 	char buffer[128];
 	va_list ap;
 
@@ -215,6 +215,11 @@ wl_resource_post_error(struct wl_resource *resource,
 	vsnprintf(buffer, sizeof buffer, msg, ap);
 	va_end(ap);
 
+	if (resource == NULL)
+		return;
+	else
+		client = resource->client;
+	
 	client->error = 1;
 
 	/*
-- 
1.7.9.5