CVE-2019-10056

An issue was discovered in Suricata 4.1.3. The code mishandles the case of
sending a network packet with the right type, such that the function
DecodeEthernet in decode-ethernet.c is executed a second time. At this
point, the algorithm cuts the first part of the packet and doesn’t
determine the current length. Specifically, if the packet is exactly 28
long, in the first iteration it subtracts 14 bytes. Then, it is working
with a packet length of 14. At this point, the case distinction says it is
a valid packet. After that it casts the packet, but this packet has no
type, and the program crashes at the type case distinction.