From: Anant Thazhemadam Date: Mon, 7 Dec 2020 06:16:06 +0000 (+0100) Subject: media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte() X-Git-Tag: v4.19.218~218 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5c217fa1c1ab36f49e1fc5c5659bbc0d6817e36a;p=users%2Fdwmw2%2Flinux.git media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte() [ 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 Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- diff --git a/drivers/media/usb/dvb-usb/dibusb-common.c b/drivers/media/usb/dvb-usb/dibusb-common.c index fb1b4f2d5f9de..85b7838b3ede3 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;