linux-kernel - [PATCH AUTOSEL 4.14 20/39] media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211109010649.1191041-20-sashal@kernel.org>
Date:   Mon,  8 Nov 2021 20:06:30 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Anant Thazhemadam <anant.thazhemadam@...il.com>,
        syzbot+e27b4fd589762b0b9329@...kaller.appspotmail.com,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>, mchehab@...nel.org,
        linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 20/39] media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte()

From: Anant Thazhemadam <anant.thazhemadam@...il.com>

[ Upstream commit 899a61a3305d49e8a712e9ab20d0db94bde5929f ]

In dibusb_read_eeprom_byte(), if dibusb_i2c_msg() fails, val gets
assigned an value that's not properly initialized.
Using kzalloc() in place of kmalloc() for the buffer fixes this issue,
as the val can now be set to 0 in the event dibusb_i2c_msg() fails.

Reported-by: syzbot+e27b4fd589762b0b9329@...kaller.appspotmail.com
Tested-by: syzbot+e27b4fd589762b0b9329@...kaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/dvb-usb/dibusb-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb/dibusb-common.c b/drivers/media/usb/dvb-usb/dibusb-common.c
index bcacb0f220282..3e45642ae186b 100644
--- a/drivers/media/usb/dvb-usb/dibusb-common.c
+++ b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -226,7 +226,7 @@ int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val)
 	u8 *buf;
 	int rc;
 
-	buf = kmalloc(2, GFP_KERNEL);
+	buf = kzalloc(2, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
-- 
2.33.0