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List: linux-input
Subject: [PATCH 10/14] HID: ntrig: validate feature report details
From: Jiri Kosina <jkosina () suse ! cz>
Date: 2013-08-28 20:31:28
Message-ID: alpine.LNX.2.00.1308282221210.22181 () pobox ! suse ! cz
[Download RAW message or body]
From: Kees Cook <keescook@chromium.org>
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>
Cc: stable@kernel.org
---
drivers/hid/hid-ntrig.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-ntrig.c b/drivers/hid/hid-ntrig.c
index ef95102..5482156 100644
--- a/drivers/hid/hid-ntrig.c
+++ b/drivers/hid/hid-ntrig.c
@@ -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;
hid_hw_request(hdev, report, HID_REQ_GET_REPORT);
--
Jiri Kosina
SUSE Labs
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