[PATCH][SRU][TRUSTY] Fix for CVE-2018-10087

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

https://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-10087.html

Clean cherry pick.

zhongjiang (1):
  kernel/exit.c: avoid undefined behaviour when calling wait4()

 kernel/exit.c | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.7.4