From 14529b6d1c4a6d405b23157eca8a4b0bec632e00 Mon Sep 17 00:00:00 2001
From: Umang Jain <email@uajain.com>
Date: Fri, 4 Dec 2020 12:24:50 +0530
Subject: simple-cam: Early return if no cameras are found on the system

Failing to do so, the codepath will segfault while trying to acquire
a non-existent camera.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 simple-cam.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'simple-cam.cpp')

diff --git a/simple-cam.cpp b/simple-cam.cpp
index fefc980..bfe30d7 100644
--- a/simple-cam.cpp
+++ b/simple-cam.cpp
@@ -307,6 +307,13 @@ int main()
 	for (std::unique_ptr<Request> &request : requests)
 		camera->queueRequest(request.get());
 
+	if (!cm->cameras().size()) {
+		std::cout << "No cameras were identified on the system."
+			  << std::endl;
+		cm->stop();
+		return EXIT_FAILURE;
+	}
+
 	/*
 	 * --------------------------------------------------------------------
 	 * Run an EventLoop
-- 
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