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HID: ntrig: validate feature report details

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commit 875b4e3763 upstream.

A HID device could send a malicious feature report that would cause the
ntrig HID driver to trigger a NULL dereference during initialization:

[57383.031190] usb 3-1: New USB device found, idVendor=1b96, idProduct=0001
...
[57383.315193] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[57383.315308] IP: [<ffffffffa08102de>] ntrig_probe+0x25e/0x420 [hid_ntrig]

CVE-2013-2896

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rafi Rubin <rafi@seas.upenn.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
This commit is contained in:
Kees Cook
2013-08-28 22:31:28 +02:00
committed by Kamal Mostafa
parent 10eb027290
commit 557ef2fd7c
1 changed files with 2 additions and 1 deletions
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3
drivers/hid/hid-ntrig.c
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@@ -115,7 +115,8 @@ static inline int ntrig_get_mode(struct hid_device *hdev)
struct hid_report *report = hdev->report_enum[HID_FEATURE_REPORT].
report_id_hash[0x0d];
if (!report)
if (!report || report->maxfield < 1 ||
report->field[0]->report_count < 1)
return -EINVAL;
usbhid_submit_report(hdev, report, USB_DIR_IN);