tag 4ddf880f9c202354c3d3bd85ac62fc3c6bf194e3
tagger Todd Kjos <tkjos@google.com> Mon May 04 18:08:12 2020 -0700
object f850f1c9f06a748cb91e75107f8dbebd5adb1981

https://source.android.com/security/bulletin/2020-05-01
CVE-2020-0110
CVE-2019-19536

commit f850f1c9f06a748cb91e75107f8dbebd5adb1981
author Suren Baghdasaryan <surenb@google.com> Mon Feb 03 13:22:16 2020 -0800
committer Todd Kjos <tkjos@google.com> Fri May 01 16:57:33 2020 -0700
tree eaaaa3d1674f0905c3e3fbd1b40f5d758cd6b4d6
parent d5ab0f8500027cdc11efb1a2d655718a81fb9cc7

UPSTREAM: sched/psi: Fix OOB write when writing 0 bytes to PSI files

Issuing write() with count parameter set to 0 on any file under
/proc/pressure/ will cause an OOB write because of the access to
buf[buf_size-1] when NUL-termination is performed. Fix this by checking
for buf_size to be non-zero.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lkml.kernel.org/r/20200203212216.7076-1-surenb@google.com

(cherry picked from commit 6fcca0fa48118e6d63733eb4644c6cd880c15b8f)

Bug: 148159562
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I9ec7acfc6e1083c677a95b0ea1c559ab50152873