Fix integer overflow in URI parsing

If an ID exeeds the max. possible value we return early with an error
instead of continuing and checking for too big values at the end.

Author: LukasWoodtli

core/uri.c

@@ -71,6 +71,9 @@ static int prv_parseNumber(uint8_t * uriString,
         {
             result *= 10;
             result += uriString[*headP] - '0';
+            if (result > LWM2M_MAX_ID) {
+                return -1;
+            }
         }
         else
         {

tests/fuzzing/registration_handleRequest/crash_files/crash-4e842fc818f746482a3bfd0029ed4b5ed5b044d3

@@ -0,0 +1 @@
+</37777777777>/>/