USB: serial: io_ti: fix array underflow in completion handler

commit 691a03cfe8ca483f9c48153b869d354e4ae3abef upstream.

As reported by Dan Carpenter, a malicious USB device could set
port_number to a negative value and we would underflow the port array in
the interrupt completion handler.

As these devices only have one or two ports, fix this by making sure we
only consider the seventh bit when determining the port number (and
ignore bits 0xb0 which are typically set to 0x30).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/io_ti.h b/drivers/usb/serial/io_ti.h
index 1bd67b2..bc9ff5e 100644 (file)
--- a/drivers/usb/serial/io_ti.h
+++ b/drivers/usb/serial/io_ti.h
@@ -178,7 +178,7 @@ struct ump_interrupt {
 }  __attribute__((packed));
 
 
-#define TIUMP_GET_PORT_FROM_CODE(c)    (((c) >> 4) - 3)
+#define TIUMP_GET_PORT_FROM_CODE(c)    (((c) >> 6) & 0x01)
 #define TIUMP_GET_FUNC_FROM_CODE(c)    ((c) & 0x0f)
 #define TIUMP_INTERRUPT_CODE_LSR       0x03
 #define TIUMP_INTERRUPT_CODE_MSR       0x04