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[ Upstream commit 3ad49d37cf5759c3b8b68d02e3563f633d9c1aee ] There is a upper bound to "catlen" but no lower bound to prevent negatives. I don't see that this necessarily causes a problem but we may as well be safe. Fixes: e114e473771c ("Smack: Simplified Mandatory Access Control Kernel") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Sasha Levin <sashal@kernel.org>