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authorJohan Hovold <johan@kernel.org>2017-01-03 16:40:00 +0100
committerJohan Hovold <johan@kernel.org>2017-01-04 10:43:56 +0100
commit76ab439ed1b68778e9059c79ecc5d14de76c89a8 (patch)
tree6ef06a8b28a032bcba36504d840450e1d5cc9e6a /drivers/usb
parent5afeef2366db14587b65558bbfd5a067542e07fb (diff)
downloadlinux-76ab439ed1b68778e9059c79ecc5d14de76c89a8.tar.bz2
USB: serial: pl2303: fix NULL-deref at open
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") Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/pl2303.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index ae682e4eeaef..46fca6b75846 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -220,9 +220,17 @@ static int pl2303_probe(struct usb_serial *serial,
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_01;
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;