From f6db56929faf451a9554c2bf556a88f9318e226c Mon Sep 17 00:00:00 2001
From: Lucio Torre <lucio@satellogic.com>
Date: Wed, 30 Mar 2016 14:30:15 +0200
Subject: [PATCH] cbor: check return value for zero

---
 sys/cbor/cbor.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/cbor/cbor.c b/sys/cbor/cbor.c
index cc50b41175..ff264bcdac 100644
--- a/sys/cbor/cbor.c
+++ b/sys/cbor/cbor.c
@@ -439,6 +439,10 @@ size_t cbor_deserialize_int(const cbor_stream_t *stream, size_t offset, int *val
     uint64_t buf;
     size_t read_bytes = decode_int(stream, offset, &buf);
 
+    if (!read_bytes) {
+        return 0;
+    }
+
     if (CBOR_TYPE(stream, offset) == CBOR_UINT) {
         *val = buf; /* resolve as CBOR_UINT */
     }