This is a note to let you know that I've just added the patch titled
USB: serial: mos7840: fix status-register error handling
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 794744abfffef8b1f3c0c8a4896177d6d13d653d Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Wed, 4 Jul 2018 17:02:17 +0200 Subject: USB: serial: mos7840: fix status-register error handling
Add missing transfer-length sanity check to the status-register completion handler to avoid leaking bits of uninitialised slab data to user space.
Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver") Cc: stable stable@vger.kernel.org # 2.6.19 Signed-off-by: Johan Hovold johan@kernel.org --- drivers/usb/serial/mos7840.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index fdceb46d9fc6..b580b4c7fa48 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -468,6 +468,9 @@ static void mos7840_control_callback(struct urb *urb) }
dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length); + if (urb->actual_length < 1) + goto out; + dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__, mos7840_port->MsrLsr, mos7840_port->port_num); data = urb->transfer_buffer;