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Fixes possible use-after-free vulnerability in keyring facility.
Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
?id=3a50597de8635cd05133bd12c95681c82fe7b878
References:
http://perception-point.io/2016/01/14/analysis-and-exploitation-of-
a-linux-kernel-vulnerability-cve-2016-0728/
https://bugzilla.redhat.com/show_bug.cgi?id=1297475
Red Hat KCS article:
https://access.redhat.com/articles/2131021
Patch is taken from:
https://bugzilla.redhat.com/attachment.cgi?id=1116563
Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Tudor Florea <tudor.florea@enea.com>
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