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[ Upstream commit fbd2a05f29a95d5b42b294bf47e55a711424965b ] Instead of using a tiny, static scratch buffer, we should use a kmalloc()-ed buffer that is allocated when checking for read plus usage. This lets us use the buffer before decoding any part of the READ_PLUS operation instead of setting it right before segment decoding, meaning it should be a little more robust. Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Stable-dep-of: bb05a617f06b ("NFSv4.2: Fix READ_PLUS smatch warnings") Signed-off-by: Sasha Levin <sashal@kernel.org>