Description: bpf/verifier: fix bounds calculation on BPF_RSH
References:
 http://www.openwall.com/lists/oss-security/2017/12/21/2
Notes:
 carnil> Introduced by b03c9f9fdc37dab81ea04d5dacdc5995d4c224c2 in 4.14-rc1
Bugs:
upstream: released (4.15-rc5) [4374f256ce8182019353c0c639bb8d0695b4c941]
4.9-upstream-stable: N/A "Vulnerable code introduced in 4.14-rc1"
3.16-upstream-stable: N/A "Vulnerable code introduced in 4.14-rc1"
3.2-upstream-stable: N/A "Vulnerable code introduced in 4.14-rc1"
sid: released (4.14.7-1) [/bugfix/all/bpf-verifier-fix-bounds-calculation-on-bpf_rsh.patch]
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"
3.2-wheezy-security: N/A "Vulnerable code not present"