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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Tom Seewald <tseewald@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH 29/69] char: hpet: add checks after calling ioremap
Date:   Mon,  3 May 2021 13:56:56 +0200
Message-Id: <20210503115736.2104747-30-gregkh@linuxfoundation.org>
In-Reply-To: <20210503115736.2104747-1-gregkh@linuxfoundation.org>
References: <20210503115736.2104747-1-gregkh@linuxfoundation.org>
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From: Tom Seewald <tseewald@gmail.com>

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/char/hpet.c | 4 ++++
 1 file changed, 4 insertions(+)

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);
-- 
2.31.1