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authorKees Cook <keescook@chromium.org>2013-09-11 21:56:55 +0200
committerJiri Kosina <jkosina@suse.cz>2013-09-13 15:13:00 +0200
commit0a9cd0a80ac559357c6a90d26c55270ed752aa26 (patch)
tree4b8a21d6810bd98fea6a31b69f9885bca04b10aa /drivers/hid
parent0fb6bd06e06792469acc15bbe427361b56ada528 (diff)
downloadlinux-0a9cd0a80ac559357c6a90d26c55270ed752aa26.tar.bz2
HID: lenovo-tpkbd: validate output report details
A HID device could send a malicious output report that would cause the lenovo-tpkbd HID driver to write just beyond the output report allocation during initialization, causing a heap overflow: [ 76.109807] usb 1-1: New USB device found, idVendor=17ef, idProduct=6009 ... [ 80.462540] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten CVE-2013-2894 Signed-off-by: Kees Cook <keescook@chromium.org> Cc: stable@vger.kernel.org Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-lenovo-tpkbd.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/hid/hid-lenovo-tpkbd.c b/drivers/hid/hid-lenovo-tpkbd.c
index 07837f5a4eb8..762d988548a2 100644
--- a/drivers/hid/hid-lenovo-tpkbd.c
+++ b/drivers/hid/hid-lenovo-tpkbd.c
@@ -339,7 +339,15 @@ static int tpkbd_probe_tp(struct hid_device *hdev)
struct tpkbd_data_pointer *data_pointer;
size_t name_sz = strlen(dev_name(dev)) + 16;
char *name_mute, *name_micmute;
- int ret;
+ int i, ret;
+
+ /* Validate required reports. */
+ for (i = 0; i < 4; i++) {
+ if (!hid_validate_values(hdev, HID_FEATURE_REPORT, 4, i, 1))
+ return -ENODEV;
+ }
+ if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 3, 0, 2))
+ return -ENODEV;
if (sysfs_create_group(&hdev->dev.kobj,
&tpkbd_attr_group_pointer)) {