[PATCH 3.2 082/199] USB: serial: pl2303: fix NULL-deref at open

[Ben Hutchings]

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jo...@kernel.org>

commit 76ab439ed1b68778e9059c79ecc5d14de76c89a8 upstream.

Fix NULL-pointer dereference in open() should a type-0 or type-1 device
lack the expected endpoints:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at pl2303_open+0x38/0xec [pl2303]

Note that a missing interrupt-in endpoint would have caused open() to
fail.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <jo...@kernel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/usb/serial/pl2303.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -185,10 +185,18 @@ static int pl2303_vendor_write(__u16 val
 static int pl2303_startup(struct usb_serial *serial)
 {
        struct pl2303_private *priv;
+       unsigned char num_ports = serial->num_ports;
        enum pl2303_type type = type_0;
        unsigned char *buf;
        int i;
 
+       if (serial->num_bulk_in < num_ports ||
+                       serial->num_bulk_out < num_ports ||
+                       serial->num_interrupt_in < num_ports) {
+               dev_err(&serial->interface->dev, "missing endpoints\n");
+               return -ENODEV;
+       }
+
        buf = kmalloc(10, GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;