CVE-2019-10050

A buffer over-read issue was discovered in Suricata 4.1.x before 4.1.4. If
the input of the decode-mpls.c function DecodeMPLS is composed only of a
packet of source address and destination address plus the correct type
field and the right number for shim, an attacker can manipulate the control
flow, such that the condition to leave the loop is true. After leaving the
loop, the network packet has a length of 2 bytes. There is no validation of
this length. Later on, the code tries to read at an empty position, leading
to a crash.