ext4: use kmemdup() to replace kmalloc + memcpy
[ Upstream commit 4efd9f0d ] Replace kmalloc + memcpy with kmemdup() Signed-off-by: Shuqi Zhang <zhangshuqi3@huawei.com> Reviewed-by: Ritesh Harjani <ritesh.list@gmail.com> Link: https://lore.kernel.org/r/20220525030120.803330-1-zhangshuqi3@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Stable-dep-of: a44e84a9 ("ext4: fix deadlock due to mbcache entry corruption") Signed-off-by: Sasha Levin <sashal@kernel.org>
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