[PATCH][SRU][TRUSTY] Fix for CVE-2018-10124

[Colin King]

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

https://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-10124.html

Clean cherry pick

zhongjiang (1):
  kernel/signal.c: avoid undefined behaviour in kill_something_info

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

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1.9.1