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char: hpet: add checks after calling ioremap
[ Upstream commit b11701c ] The function hpet_resources() calls ioremap() two times, but in both cases it does not check if ioremap() returned a null pointer. Fix this by adding null pointer checks and returning an appropriate error. Signed-off-by: Tom Seewald <tseewald@gmail.com> Link: https://lore.kernel.org/r/20210503115736.2104747-30-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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