This is a note to let you know that I've just added the patch titled USB: serial: safe_serial: fix information leak in completion handler to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-serial-safe_serial-fix-information-leak-in-completion-handler.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 8c76d7cd520ebffc1ea9ea0850d87a224a50c7f2 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan@xxxxxxxxxx> Date: Mon, 6 Mar 2017 17:36:41 +0100 Subject: USB: serial: safe_serial: fix information leak in completion handler From: Johan Hovold <johan@xxxxxxxxxx> commit 8c76d7cd520ebffc1ea9ea0850d87a224a50c7f2 upstream. Add missing sanity check to the bulk-in completion handler to avoid an integer underflow that could be triggered by a malicious device. This avoids leaking up to 56 bytes from after the URB transfer buffer to user space. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/serial/safe_serial.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/usb/serial/safe_serial.c +++ b/drivers/usb/serial/safe_serial.c @@ -200,6 +200,11 @@ static void safe_process_read_urb(struct if (!safe) goto out; + if (length < 2) { + dev_err(&port->dev, "malformed packet\n"); + return; + } + fcs = fcs_compute10(data, length, CRC10_INITFCS); if (fcs) { dev_err(&port->dev, "%s - bad CRC %x\n", __func__, fcs); Patches currently in stable-queue which might be from johan@xxxxxxxxxx are queue-4.9/usb-serial-digi_acceleport-fix-oob-event-processing.patch queue-4.9/usb-serial-omninet-fix-reference-leaks-at-open.patch queue-4.9/usb-serial-digi_acceleport-fix-oob-data-sanity-check.patch queue-4.9/usb-iowarrior-fix-null-deref-in-write.patch queue-4.9/usb-iowarrior-fix-null-deref-at-probe.patch queue-4.9/usb-serial-io_ti-fix-null-deref-in-interrupt-callback.patch queue-4.9/usb-serial-io_ti-fix-information-leak-in-completion-handler.patch queue-4.9/usb-serial-safe_serial-fix-information-leak-in-completion-handler.patch