USB: serial/mos*: prevent reading uninitialized stack memory

The TIOCGICOUNT device ioctl in both mos7720.c and mos7840.c allows
unprivileged users to read uninitialized stack memory, because the
"reserved" member of the serial_icounter_struct struct declared on the
stack is not altered or zeroed before being copied back to the user.
This patch takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 30922a7e3347494b5ca30b81ea77e53ea767e91e..aa665817a2720414a7e669b20499d62ebca4b6db 100644 (file)
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -2024,6 +2024,9 @@ static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
 
        case TIOCGICOUNT:
                cnow = mos7720_port->icount;
+
+               memset(&icount, 0, sizeof(struct serial_icounter_struct));
+
                icount.cts = cnow.cts;
                icount.dsr = cnow.dsr;
                icount.rng = cnow.rng;

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 1c9b6e9b2386e5032da1e3b8a095525222dc8cb5..1a42bc2137995bea0b70905cfe518674242141fd 100644 (file)
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -2285,6 +2285,9 @@ static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
        case TIOCGICOUNT:
                cnow = mos7840_port->icount;
                smp_rmb();
+
+               memset(&icount, 0, sizeof(struct serial_icounter_struct));
+
                icount.cts = cnow.cts;
                icount.dsr = cnow.dsr;
                icount.rng = cnow.rng;