summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorJohan Hovold <johan@kernel.org>2017-03-13 13:53:58 +0100
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-04-10 12:34:46 +0200
commit65f921647f4c89a2068478c89691f39b309b58f7 (patch)
tree9c94ea4fb91f3917f9e407e8b5a8e3c1da359316
parent[media] cx231xx-audio: fix init error path (diff)
downloadlinux-65f921647f4c89a2068478c89691f39b309b58f7.tar.xz
linux-65f921647f4c89a2068478c89691f39b309b58f7.zip
[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>
-rw-r--r--drivers/media/usb/cx231xx/cx231xx-audio.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-audio.c b/drivers/media/usb/cx231xx/cx231xx-audio.c
index f3729d6eb46a..a050d125934c 100644
--- 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);