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media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte()

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[ 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@syzkaller.appspotmail.com
Tested-by: syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anant Thazhemadam 2020-12-07 07:16:06 +01:00 committed by Greg Kroah-Hartman
parent 688ac68a23
commit 74339549c8
1 changed files with 1 additions and 1 deletions
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2
drivers/media/usb/dvb-usb/dibusb-common.c
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@ -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;