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[ Upstream commitf87391558a] When nbytes < 4, end is wronlgy set to a negative value which, due to uint, is then interpreted to a large value leading to a deadlock in the following code. This patch fix this problem. Fixes:6298e94821("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator") Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org>