From: Tom Seewald tseewald@gmail.com
[ Upstream commit b11701c933112d49b808dee01cb7ff854ba6a77a ]
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.o... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/char/hpet.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index c0732f032248..68f02318cee3 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -975,6 +975,8 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data) if (ACPI_SUCCESS(status)) { hdp->hd_phys_address = addr.address.minimum; hdp->hd_address = ioremap(addr.address.minimum, addr.address.address_length); + if (!hdp->hd_address) + return AE_ERROR;
if (hpet_is_known(hdp)) { iounmap(hdp->hd_address); @@ -988,6 +990,8 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data) hdp->hd_phys_address = fixmem32->address; hdp->hd_address = ioremap(fixmem32->address, HPET_RANGE_SIZE); + if (!hdp->hd_address) + return AE_ERROR;
if (hpet_is_known(hdp)) { iounmap(hdp->hd_address);