[media] cx231xx-audio: fix NULL-deref at probe

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver")

Cc: stable <stable@vger.kernel.org>     # 2.6.30
Cc: Sri Deevi <Srinivasa.Deevi@conexant.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/usb/cx231xx/cx231xx-audio.c b/drivers/media/usb/cx231xx/cx231xx-audio.c
index f3729d6..a050d12 100644 (file)
--- a/drivers/media/usb/cx231xx/cx231xx-audio.c
+++ b/drivers/media/usb/cx231xx/cx231xx-audio.c
@@ -697,6 +697,11 @@ static int cx231xx_audio_init(struct cx231xx *dev)
                                            hs_config_info[0].interface_info.
                                            audio_index + 1];
 
+       if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {
+               err = -ENODEV;
+               goto err_free_card;
+       }
+
        adev->end_point_addr =
            uif->altsetting[0].endpoint[isoc_pipe].desc.
                        bEndpointAddress;
@@ -712,8 +717,14 @@ static int cx231xx_audio_init(struct cx231xx *dev)
        }
 
        for (i = 0; i < adev->num_alt; i++) {
-               u16 tmp =
-                   le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
+               u16 tmp;
+
+               if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {
+                       err = -ENODEV;
+                       goto err_free_pkt_size;
+               }
+
+               tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
                                wMaxPacketSize);
                adev->alt_max_pkt_size[i] =
                    (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
@@ -724,6 +735,8 @@ static int cx231xx_audio_init(struct cx231xx *dev)
 
        return 0;
 
+err_free_pkt_size:
+       kfree(adev->alt_max_pkt_size);
 err_free_card:
        snd_card_free(card);