diff options
| author | Colin Ian King <colin.king@canonical.com> | 2018-10-06 14:01:42 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-25 09:53:47 +0100 |
| commit | 97fe3401a6b8475f86bd49b8e4613413e601a109 (patch) | |
| tree | 09df7254dca58d1a7e7778fed71e734c739e8904 /drivers/media/usb | |
| parent | 5387916931cd2b2f7965d7318d7791ee30baf0af (diff) | |
media: cx231xx: fix potential sign-extension overflow on large shift
[ Upstream commit 32ae592036d7aeaabcccb2b1715373a68639a768 ]
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>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/cx231xx/cx231xx-video.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c index 6414188ffdfa..cd973e780da9 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 */ |