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From: Colin King <colin.king@canonical.com>
To: Jiri Kosina <jikos@kernel.org>,
	Benjamin Tissoires <benjamin.tissoires@redhat.com>,
	Nestor Lopez Casado <nlopezcasad@logitech.com>,
	linux-input@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] HID: logitech-dj: fix unintentional integer overflow on left shift
Date: Sun,  7 Feb 2021 23:21:20 +0000	[thread overview]
Message-ID: <20210207232120.8885-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

Shifting the integer value 1 is evaluated using 32-bit rithmetic
and then used in an expression that expects a 64-bit value, so
there is potentially an integer overflow. Fix this by using th
BIT_ULL macro to perform the shift and avoid the overflow.

Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 534a7b8e10ec ("HID: Add full support for Logitech Unifying receivers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/hid/hid-logitech-dj.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 45e7e0bdd382..747f41be0603 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -1035,7 +1035,7 @@ static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
 	memset(reportbuffer, 0, sizeof(reportbuffer));
 
 	for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
-		if (djdev->reports_supported & (1 << i)) {
+		if (djdev->reports_supported & BIT_ULL(i)) {
 			reportbuffer[0] = i;
 			if (hid_input_report(djdev->hdev,
 					     HID_INPUT_REPORT,
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Jiri Kosina <jikos@kernel.org>,
	Benjamin Tissoires <benjamin.tissoires@redhat.com>,
	Nestor Lopez Casado <nlopezcasad@logitech.com>,
	linux-input@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] HID: logitech-dj: fix unintentional integer overflow on left shift
Date: Sun, 07 Feb 2021 23:21:20 +0000	[thread overview]
Message-ID: <20210207232120.8885-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

Shifting the integer value 1 is evaluated using 32-bit rithmetic
and then used in an expression that expects a 64-bit value, so
there is potentially an integer overflow. Fix this by using th
BIT_ULL macro to perform the shift and avoid the overflow.

Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 534a7b8e10ec ("HID: Add full support for Logitech Unifying receivers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/hid/hid-logitech-dj.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 45e7e0bdd382..747f41be0603 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -1035,7 +1035,7 @@ static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
 	memset(reportbuffer, 0, sizeof(reportbuffer));
 
 	for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
-		if (djdev->reports_supported & (1 << i)) {
+		if (djdev->reports_supported & BIT_ULL(i)) {
 			reportbuffer[0] = i;
 			if (hid_input_report(djdev->hdev,
 					     HID_INPUT_REPORT,
-- 
2.29.2

             reply	other threads:[~2021-02-07 23:22 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-07 23:21 Colin King [this message]
2021-02-07 23:21 ` [PATCH] HID: logitech-dj: fix unintentional integer overflow on left shift Colin King
2021-02-08 15:06 ` Dan Carpenter
2021-02-08 15:06   ` Dan Carpenter
2021-02-08 15:07   ` Colin Ian King
2021-02-08 15:07     ` Colin Ian King

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