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authorTom Seewald <tseewald@gmail.com>2021-05-03 13:56:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-05-13 17:33:36 +0200
commitb11701c933112d49b808dee01cb7ff854ba6a77a (patch)
treed91ea71ea837c5328e0927245b93c0fe9d7d0d9d /drivers/char/hpet.c
parent566f53238da74801b48e985788e5f7c9159e5940 (diff)
char: hpet: add checks after calling ioremap
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>
Diffstat (limited to 'drivers/char/hpet.c')
-rw-r--r--drivers/char/hpet.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 6f13def6c172..8b55085650ad 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -969,6 +969,8 @@ 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);
@@ -982,6 +984,8 @@ 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);