| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 018/213] HID: pantherlord: validate output report details | Date | Wed, 5 Feb 2014 14:59:33 -0500 |
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From: Kees Cook <keescook@chromium.org>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
commit 412f30105ec6735224535791eed5cdc02888ecb4 upstream.
A HID device could send a malicious output report that would cause the pantherlord HID driver to write beyond the output report allocation during initialization, causing a heap overflow:
[ 310.939483] usb 1-1: New USB device found, idVendor=0e8f, idProduct=0003 ... [ 315.980774] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten
CVE-2013-2892
Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- drivers/hid/hid-pl.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-pl.c b/drivers/hid/hid-pl.c index 9f41e2bd8483..427f3a57aa23 100644 --- a/drivers/hid/hid-pl.c +++ b/drivers/hid/hid-pl.c @@ -129,8 +129,14 @@ static int plff_init(struct hid_device *hid) strong = &report->field[0]->value[2]; weak = &report->field[0]->value[3]; debug("detected single-field device"); - } else if (report->maxfield >= 4 && report->field[0]->maxusage == 1 && - report->field[0]->usage[0].hid == (HID_UP_LED | 0x43)) { + } else if (report->field[0]->maxusage == 1 && + report->field[0]->usage[0].hid == + (HID_UP_LED | 0x43) && + report->maxfield >= 4 && + report->field[0]->report_count >= 1 && + report->field[1]->report_count >= 1 && + report->field[2]->report_count >= 1 && + report->field[3]->report_count >= 1) { report->field[0]->value[0] = 0x00; report->field[1]->value[0] = 0x00; strong = &report->field[2]->value[0]; -- 1.8.5.2
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