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Groups > linux.kernel > #1715190
| From | Ben Hutchings <ben@decadent.org.uk> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.2 20/59] [media] cx231xx-cards: fix NULL-deref at probe |
| Date | 2017-08-18 16:30 +0200 |
| Message-ID | <ufQrG-4YI-47@gated-at.bofh.it> (permalink) |
| References | <ufPlU-4d0-25@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.2.92-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@kernel.org>
commit 0cd273bb5e4d1828efaaa8dfd11b7928131ed149 upstream.
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: 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>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/media/video/cx231xx/cx231xx-cards.c | 45 +++++++++++++++++++++++++++----
1 file changed, 40 insertions(+), 5 deletions(-)
--- a/drivers/media/video/cx231xx/cx231xx-cards.c
+++ b/drivers/media/video/cx231xx/cx231xx-cards.c
@@ -1159,6 +1159,9 @@ static int cx231xx_usb_probe(struct usb_
uif = udev->actconfig->interface[dev->current_pcb_config.
hs_config_info[0].interface_info.video_index + 1];
+ if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
dev->video_mode.end_point_addr = le16_to_cpu(uif->altsetting[0].
endpoint[isoc_pipe].desc.bEndpointAddress);
@@ -1176,8 +1179,12 @@ static int cx231xx_usb_probe(struct usb_
}
for (i = 0; i < dev->video_mode.num_alt; i++) {
- u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].
- desc.wMaxPacketSize);
+ u16 tmp;
+
+ if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
+ tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.wMaxPacketSize);
dev->video_mode.alt_max_pkt_size[i] =
(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
cx231xx_info("Alternate setting %i, max size= %i\n", i,
@@ -1189,6 +1196,9 @@ static int cx231xx_usb_probe(struct usb_
hs_config_info[0].interface_info.
vanc_index + 1];
+ if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
dev->vbi_mode.end_point_addr =
le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
bEndpointAddress);
@@ -1207,8 +1217,12 @@ static int cx231xx_usb_probe(struct usb_
}
for (i = 0; i < dev->vbi_mode.num_alt; i++) {
- u16 tmp =
- le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].
+ u16 tmp;
+
+ if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
+ tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].
desc.wMaxPacketSize);
dev->vbi_mode.alt_max_pkt_size[i] =
(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
@@ -1221,6 +1235,9 @@ static int cx231xx_usb_probe(struct usb_
hs_config_info[0].interface_info.
hanc_index + 1];
+ if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
dev->sliced_cc_mode.end_point_addr =
le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
bEndpointAddress);
@@ -1239,7 +1256,12 @@ static int cx231xx_usb_probe(struct usb_
}
for (i = 0; i < dev->sliced_cc_mode.num_alt; i++) {
- u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].
+ u16 tmp;
+
+ if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1)
+ return -ENODEV;
+
+ tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].
desc.wMaxPacketSize);
dev->sliced_cc_mode.alt_max_pkt_size[i] =
(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
@@ -1254,6 +1276,11 @@ static int cx231xx_usb_probe(struct usb_
interface_info.
ts1_index + 1];
+ if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {
+ retval = -ENODEV;
+ goto err_video_alt;
+ }
+
dev->ts1_mode.end_point_addr =
le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].
desc.bEndpointAddress);
@@ -1272,7 +1299,14 @@ static int cx231xx_usb_probe(struct usb_
}
for (i = 0; i < dev->ts1_mode.num_alt; i++) {
- u16 tmp = le16_to_cpu(uif->altsetting[i].
+ u16 tmp;
+
+ if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {
+ retval = -ENODEV;
+ goto err_video_alt;
+ }
+
+ tmp = le16_to_cpu(uif->altsetting[i].
endpoint[isoc_pipe].desc.
wMaxPacketSize);
dev->ts1_mode.alt_max_pkt_size[i] =
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[PATCH 3.2 00/59] 3.2.92-rc1 review Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 35/59] [media] dw2102: limit messages to buffer size Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 24/59] PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 17/59] [media] gspca: konica: add missing endpoint sanity check Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 13/59] [media] mceusb: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 20/59] [media] cx231xx-cards: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 32/59] [media] ttusb2: limit messages to buffer size Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 02/59] [media] pvrusb2: reduce stack usage pvr2_eeprom_analyze() Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 22/59] [media] cx231xx-audio: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 04/59] ath9k_htc: Add PID/VID for a Ubiquiti WiFiStation Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 10/59] zd1211rw: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 27/59] PCI: Ignore write combining when mapping I/O port space Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 06/59] ath9k_htc: Add new USB ID Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 25/59] [media] digitv: limit messages to buffer size Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 [PATCH 3.2 18/59] [media] usbvision: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-08-18 16:30 +0200 Re: [PATCH 3.2 00/59] 3.2.92-rc1 review Guenter Roeck <linux@roeck-us.net> - 2017-08-18 17:00 +0200
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