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USB: serial: safe_serial: fix information leak in completion handler

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commit 8c76d7cd52 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: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-03-06 17:36:41 +01:00 committed by Greg Kroah-Hartman
parent cf09c7d60c
commit 3cdc946387
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/serial/safe_serial.c
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@ -205,6 +205,11 @@ static void safe_process_read_urb(struct urb *urb)
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);