| From | Willy Tarreau <> | Subject | [PATCH 3.10 041/250] USB: serial: pl2303: fix NULL-deref at open | Date | Thu, 8 Jun 2017 00:57:07 +0200 |
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From: Johan Hovold <johan@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 <johan@kernel.org> Signed-off-by: Willy Tarreau <w@1wt.eu> --- 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 33313ca..f496c38 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -175,9 +175,17 @@ 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; -- 2.8.0.rc2.1.gbe9624a
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