Description: sched/psi: Fix OOB write when writing 0 bytes to PSI files References: https://source.android.com/security/bulletin/2020-05-01 https://android-review.googlesource.com/c/kernel/common/+/1243775 Notes: bwh> Introduced in 5.2 by commit 0e94682b73bf "psi: introduce psi monitor". Bugs: upstream: released (5.6-rc2) [6fcca0fa48118e6d63733eb4644c6cd880c15b8f] 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 (5.5.13-1) 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"