ipgre: test csumstart instead of transport header
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.198 by commit 3d08bc3a5d9b2106f5c8bcf1adb73147824aa006, it was introduced in version v5.4.148 by commit 3d32ce5472bb2ca720bef84089b85f76a705fd1a. For more details please see the references link.