From: Guenter Roeck <linux@roeck-us.net> To: Colin King <colin.king@canonical.com> Cc: Wilken Gottwalt <wilken.gottwalt@posteo.net>, Jean Delvare <jdelvare@suse.com>, linux-hwmon@vger.kernel.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH][next] hwmon: corsair-psu: fix unintentional sign extension issue Date: Sat, 7 Nov 2020 19:36:50 -0800 [thread overview] Message-ID: <20201108033650.GA133578@roeck-us.net> (raw) In-Reply-To: <20201105115019.41735-1-colin.king@canonical.com> On Thu, Nov 05, 2020 at 11:50:19AM +0000, Colin King wrote: > From: Colin Ian King <colin.king@canonical.com> > > The shifting of the u8 integer data[3] by 24 bits to the left will > be promoted to a 32 bit signed int and then sign-extended to a > long. In the event that the top bit of data[3] is set then all > then all the upper 32 bits of a 64 bit long end up as also being > set because of the sign-extension. Fix this by casting data[3] to > a long before the shift. > > Addresses-Coverity: ("Unintended sign extension") > Fixes: ce15cd2cee8b ("hwmon: add Corsair PSU HID controller driver") > Signed-off-by: Colin Ian King <colin.king@canonical.com> I wasn't sure if I am going to get another version of this patch. Either case, I applied this now. Guenter > --- > drivers/hwmon/corsair-psu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c > index e92d0376e7ac..5d19a888231a 100644 > --- a/drivers/hwmon/corsair-psu.c > +++ b/drivers/hwmon/corsair-psu.c > @@ -241,7 +241,7 @@ static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, l > * the LINEAR11 conversion are the watts values which are about 1200 for the strongest psu > * supported (HX1200i) > */ > - tmp = (data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; > + tmp = ((long)data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; > switch (cmd) { > case PSU_CMD_IN_VOLTS: > case PSU_CMD_IN_AMPS:
WARNING: multiple messages have this Message-ID (diff)
From: Guenter Roeck <linux@roeck-us.net> To: Colin King <colin.king@canonical.com> Cc: Wilken Gottwalt <wilken.gottwalt@posteo.net>, Jean Delvare <jdelvare@suse.com>, linux-hwmon@vger.kernel.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH][next] hwmon: corsair-psu: fix unintentional sign extension issue Date: Sun, 08 Nov 2020 03:36:50 +0000 [thread overview] Message-ID: <20201108033650.GA133578@roeck-us.net> (raw) In-Reply-To: <20201105115019.41735-1-colin.king@canonical.com> On Thu, Nov 05, 2020 at 11:50:19AM +0000, Colin King wrote: > From: Colin Ian King <colin.king@canonical.com> > > The shifting of the u8 integer data[3] by 24 bits to the left will > be promoted to a 32 bit signed int and then sign-extended to a > long. In the event that the top bit of data[3] is set then all > then all the upper 32 bits of a 64 bit long end up as also being > set because of the sign-extension. Fix this by casting data[3] to > a long before the shift. > > Addresses-Coverity: ("Unintended sign extension") > Fixes: ce15cd2cee8b ("hwmon: add Corsair PSU HID controller driver") > Signed-off-by: Colin Ian King <colin.king@canonical.com> I wasn't sure if I am going to get another version of this patch. Either case, I applied this now. Guenter > --- > drivers/hwmon/corsair-psu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c > index e92d0376e7ac..5d19a888231a 100644 > --- a/drivers/hwmon/corsair-psu.c > +++ b/drivers/hwmon/corsair-psu.c > @@ -241,7 +241,7 @@ static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, l > * the LINEAR11 conversion are the watts values which are about 1200 for the strongest psu > * supported (HX1200i) > */ > - tmp = (data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; > + tmp = ((long)data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; > switch (cmd) { > case PSU_CMD_IN_VOLTS: > case PSU_CMD_IN_AMPS:
next prev parent reply other threads:[~2020-11-08 3:36 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-05 11:50 [PATCH][next] hwmon: corsair-psu: fix unintentional sign extension issue Colin King 2020-11-05 11:50 ` Colin King 2020-11-05 12:32 ` Wilken Gottwalt 2020-11-05 12:32 ` Wilken Gottwalt 2020-11-05 12:44 ` Colin Ian King 2020-11-05 12:44 ` Colin Ian King 2020-11-05 14:15 ` Guenter Roeck 2020-11-05 14:15 ` Guenter Roeck 2020-11-05 14:59 ` Wilken Gottwalt 2020-11-05 14:59 ` Wilken Gottwalt 2020-11-08 3:36 ` Guenter Roeck [this message] 2020-11-08 3:36 ` Guenter Roeck
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