From: Anant Thazhemadam <anant.thazhemadam@gmail.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>,
Anant Thazhemadam <anant.thazhemadam@gmail.com>
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com
Subject: [PATCH] media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte()
Date: Mon, 7 Dec 2020 11:46:06 +0530 [thread overview]
Message-ID: <20201207061606.163403-1-anant.thazhemadam@gmail.com> (raw)
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@syzkaller.appspotmail.com
Tested-by: syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
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 02b51d1a1b67..aff60c10cb0b 100644
--- a/drivers/media/usb/dvb-usb/dibusb-common.c
+++ b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -223,7 +223,7 @@ 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;
--
2.25.1
reply other threads:[~2020-12-07 6:17 UTC|newest]
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