ussd: Add a test case, switch parsing to use a gsm48_hdr and len

The current USSD code is not doing any size checks, add a test
case to find out how easily we access the data out of bounds.
Begin to use the length in some places.

1 files changed, 3 insertions, 1 deletions

diff --git a/include/osmocore/gsm0480.h b/include/osmocore/gsm0480.h
index ae92c1f9..94ac7174 100644
--- a/include/osmocore/gsm0480.h
+++ b/include/osmocore/gsm0480.h
@@ -2,6 +2,8 @@
 #define gsm0480_h
 
 #include "msgb.h"
+#include "protocol/gsm_04_08.h"
+#include "protocol/gsm_04_80.h"
 
 #define MAX_LEN_USSD_STRING	31
 
@@ -11,7 +13,7 @@ struct ussd_request {
 	uint8_t invoke_id;
 };
 
-int gsm0480_decode_ussd_request(const struct msgb *msg,
+int gsm0480_decode_ussd_request(const struct gsm48_hdr *hdr, uint16_t len,
 				struct ussd_request *request);
 
 struct msgb *gsm0480_create_unstructuredSS_Notify(int alertPattern, const char *text);