From: Johan Hovold <johan@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
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 <johan@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/usb/serial/pl2303.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index e47f9c642404..23f11751e05a 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -176,9 +176,17 @@ static int pl2303_vendor_write(__u16 value, __u16 index,
static int pl2303_startup(struct usb_serial *serial)
{
struct pl2303_serial_private *spriv;
+ unsigned char num_ports = serial->num_ports;
enum pl2303_type type = type_0;
unsigned char *buf;
+ 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;
+ }
+
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
return -ENOMEM;
--
2.11.0
--
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