Description: binder: check for overflow when alloc for security context
References:
 https://source.android.com/security/bulletin/pixel/2019-09-01
Notes:
 bwh> Introduced in 5.1 by commit ec74136ded79 "binder: create node flag
 bwh> to request sender's security context".
Bugs:
upstream: released (5.2-rc1) [0b0509508beff65c1d50541861bc0d4973487dc5]
4.19-upstream-stable: N/A "Vulnerable code not present"
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.2.6-1)
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"