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[ Upstream commitb281218ad4] There is an out-of-bounds access to "config[len - 1]" array when the variable "len" is zero. See commitdada6a43b0("kgdboc: fix KASAN global-out-of-bounds bug in param_set_kgdboc_var()") for details. Signed-off-by: Young Xiao <YangX92@hotmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>