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selinux: avoid dereference of garbage after mount failure
commit 37801a3 upstream. In case kern_mount() fails and returns an error pointer return in the error branch instead of continuing and dereferencing the error pointer. While on it drop the never read static variable selinuxfs_mount. Cc: stable@vger.kernel.org Fixes: 0619f0f ("selinux: wrap selinuxfs state") Signed-off-by: Christian Göttsche <cgzones@googlemail.com> Signed-off-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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