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From: Colin King <colin.king@canonical.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>, linux-media@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] media: cx231xx: fix potential sign-extension overflow on large shift
Date: Sat,  6 Oct 2018 19:01:42 +0100	[thread overview]
Message-ID: <20181006180142.28443-1-colin.king@canonical.com> (raw)

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

Shifting the u8 value[3] by an int can lead to sign-extension
overflow. For example, if value[3] is 0xff and the shift is 24 then it
is promoted to int and then the top bit is sign-extended so that all
upper 32 bits are set.  Fix this by casting value[3] to a u32 before
the shift.

Detected by CoverityScan, CID#1016522 ("Unintended sign extension")

Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/media/usb/cx231xx/cx231xx-video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index 29160df76cf7..f2f034c5cd62 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -1389,7 +1389,7 @@ int cx231xx_g_register(struct file *file, void *priv,
 		ret = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER,
 				(u16)reg->reg, value, 4);
 		reg->val = value[0] | value[1] << 8 |
-			value[2] << 16 | value[3] << 24;
+			value[2] << 16 | (u32)value[3] << 24;
 		reg->size = 4;
 		break;
 	case 1:	/* AFE - read byte */
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>, linux-media@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] media: cx231xx: fix potential sign-extension overflow on large shift
Date: Sat, 06 Oct 2018 18:01:42 +0000	[thread overview]
Message-ID: <20181006180142.28443-1-colin.king@canonical.com> (raw)

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

Shifting the u8 value[3] by an int can lead to sign-extension
overflow. For example, if value[3] is 0xff and the shift is 24 then it
is promoted to int and then the top bit is sign-extended so that all
upper 32 bits are set.  Fix this by casting value[3] to a u32 before
the shift.

Detected by CoverityScan, CID#1016522 ("Unintended sign extension")

Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/media/usb/cx231xx/cx231xx-video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index 29160df76cf7..f2f034c5cd62 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -1389,7 +1389,7 @@ int cx231xx_g_register(struct file *file, void *priv,
 		ret = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER,
 				(u16)reg->reg, value, 4);
 		reg->val = value[0] | value[1] << 8 |
-			value[2] << 16 | value[3] << 24;
+			value[2] << 16 | (u32)value[3] << 24;
 		reg->size = 4;
 		break;
 	case 1:	/* AFE - read byte */
-- 
2.17.1

             reply	other threads:[~2018-10-06 18:01 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-06 18:01 Colin King [this message]
2018-10-06 18:01 ` [PATCH] media: cx231xx: fix potential sign-extension overflow on large shift Colin King

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