From: Alan Stern <stern@rowland.harvard.edu>
To: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>,
<linux-input@vger.kernel.org>,
USB list <linux-usb@vger.kernel.org>,
<syzkaller-bugs@googlegroups.com>
Subject: [PATCH] HID: Fix assumption that devices have inputs
Date: Thu, 3 Oct 2019 14:53:59 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1910031449210.1797-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <000000000000cd1def0592ab9697@google.com>
The syzbot fuzzer found a slab-out-of-bounds write bug in the hid-gaff
driver. The problem is caused by the driver's assumption that the
device must have an input report. While this will be true for all
normal HID input devices, a suitably malicious device can violate the
assumption.
The same assumption is present in over a dozen other HID drivers.
This patch fixes them by checking that the list of hid_inputs for the
hid_device is nonempty before allowing it to be used.
Reported-and-tested-by: syzbot+403741a091bf41d4ae79@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
---
[as1921]
drivers/hid/hid-axff.c | 11 +++++++++--
drivers/hid/hid-dr.c | 12 +++++++++---
drivers/hid/hid-emsff.c | 12 +++++++++---
drivers/hid/hid-gaff.c | 12 +++++++++---
drivers/hid/hid-holtekff.c | 12 +++++++++---
drivers/hid/hid-lg2ff.c | 12 +++++++++---
drivers/hid/hid-lg3ff.c | 11 +++++++++--
drivers/hid/hid-lg4ff.c | 11 +++++++++--
drivers/hid/hid-lgff.c | 11 +++++++++--
drivers/hid/hid-logitech-hidpp.c | 11 +++++++++--
drivers/hid/hid-microsoft.c | 12 +++++++++---
drivers/hid/hid-sony.c | 12 +++++++++---
drivers/hid/hid-tmff.c | 12 +++++++++---
drivers/hid/hid-zpff.c | 12 +++++++++---
14 files changed, 126 insertions(+), 37 deletions(-)
Index: usb-devel/drivers/hid/hid-gaff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-gaff.c
+++ usb-devel/drivers/hid/hid-gaff.c
@@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *
{
struct gaff_device *gaff;
struct hid_report *report;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct list_head *report_ptr = report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
Index: usb-devel/drivers/hid/hid-axff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-axff.c
+++ usb-devel/drivers/hid/hid-axff.c
@@ -63,13 +63,20 @@ static int axff_init(struct hid_device *
{
struct axff_device *axff;
struct hid_report *report;
- struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int field_count = 0;
int i, j;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
Index: usb-devel/drivers/hid/hid-dr.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-dr.c
+++ usb-devel/drivers/hid/hid-dr.c
@@ -75,13 +75,19 @@ static int drff_init(struct hid_device *
{
struct drff_device *drff;
struct hid_report *report;
- struct hid_input *hidinput = list_first_entry(&hid->inputs,
- struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
Index: usb-devel/drivers/hid/hid-emsff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-emsff.c
+++ usb-devel/drivers/hid/hid-emsff.c
@@ -47,13 +47,19 @@ static int emsff_init(struct hid_device
{
struct emsff_device *emsff;
struct hid_report *report;
- struct hid_input *hidinput = list_first_entry(&hid->inputs,
- struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
Index: usb-devel/drivers/hid/hid-holtekff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-holtekff.c
+++ usb-devel/drivers/hid/hid-holtekff.c
@@ -124,13 +124,19 @@ static int holtekff_init(struct hid_devi
{
struct holtekff_device *holtekff;
struct hid_report *report;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output report found\n");
return -ENODEV;
Index: usb-devel/drivers/hid/hid-lg2ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg2ff.c
+++ usb-devel/drivers/hid/hid-lg2ff.c
@@ -50,11 +50,17 @@ int lg2ff_init(struct hid_device *hid)
{
struct lg2ff_device *lg2ff;
struct hid_report *report;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
/* Check that the report looks ok */
report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
if (!report)
Index: usb-devel/drivers/hid/hid-lg3ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg3ff.c
+++ usb-devel/drivers/hid/hid-lg3ff.c
@@ -117,12 +117,19 @@ static const signed short ff3_joystick_a
int lg3ff_init(struct hid_device *hid)
{
- struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
const signed short *ff_bits = ff3_joystick_ac;
int error;
int i;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
/* Check that the report looks ok */
if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35))
return -ENODEV;
Index: usb-devel/drivers/hid/hid-lg4ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg4ff.c
+++ usb-devel/drivers/hid/hid-lg4ff.c
@@ -1253,8 +1253,8 @@ static int lg4ff_handle_multimode_wheel(
int lg4ff_init(struct hid_device *hid)
{
- struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
@@ -1266,6 +1266,13 @@ int lg4ff_init(struct hid_device *hid)
int mmode_ret, mmode_idx = -1;
u16 real_product_id;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
/* Check that the report looks ok */
if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
return -1;
Index: usb-devel/drivers/hid/hid-lgff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lgff.c
+++ usb-devel/drivers/hid/hid-lgff.c
@@ -115,12 +115,19 @@ static void hid_lgff_set_autocenter(stru
int lgff_init(struct hid_device* hid)
{
- struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
const signed short *ff_bits = ff_joystick;
int error;
int i;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
/* Check that the report looks ok */
if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
return -ENODEV;
Index: usb-devel/drivers/hid/hid-logitech-hidpp.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-logitech-hidpp.c
+++ usb-devel/drivers/hid/hid-logitech-hidpp.c
@@ -2084,8 +2084,8 @@ static void hidpp_ff_destroy(struct ff_d
static int hidpp_ff_init(struct hidpp_device *hidpp, u8 feature_index)
{
struct hid_device *hid = hidpp->hid_dev;
- struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
struct ff_device *ff;
@@ -2094,6 +2094,13 @@ static int hidpp_ff_init(struct hidpp_de
int error, j, num_slots;
u8 version;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
if (!dev) {
hid_err(hid, "Struct input_dev not set!\n");
return -EINVAL;
Index: usb-devel/drivers/hid/hid-microsoft.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-microsoft.c
+++ usb-devel/drivers/hid/hid-microsoft.c
@@ -328,11 +328,17 @@ static int ms_play_effect(struct input_d
static int ms_init_ff(struct hid_device *hdev)
{
- struct hid_input *hidinput = list_entry(hdev->inputs.next,
- struct hid_input, list);
- struct input_dev *input_dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *input_dev;
struct ms_data *ms = hid_get_drvdata(hdev);
+ if (list_empty(&hdev->inputs)) {
+ hid_err(hdev, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
+ input_dev = hidinput->input;
+
if (!(ms->quirks & MS_QUIRK_FF))
return 0;
Index: usb-devel/drivers/hid/hid-sony.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-sony.c
+++ usb-devel/drivers/hid/hid-sony.c
@@ -2250,9 +2250,15 @@ static int sony_play_effect(struct input
static int sony_init_ff(struct sony_sc *sc)
{
- struct hid_input *hidinput = list_entry(sc->hdev->inputs.next,
- struct hid_input, list);
- struct input_dev *input_dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *input_dev;
+
+ if (list_empty(&sc->hdev->inputs)) {
+ hid_err(sc->hdev, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(sc->hdev->inputs.next, struct hid_input, list);
+ input_dev = hidinput->input;
input_set_capability(input_dev, EV_FF, FF_RUMBLE);
return input_ff_create_memless(input_dev, NULL, sony_play_effect);
Index: usb-devel/drivers/hid/hid-tmff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-tmff.c
+++ usb-devel/drivers/hid/hid-tmff.c
@@ -114,12 +114,18 @@ static int tmff_init(struct hid_device *
struct tmff_device *tmff;
struct hid_report *report;
struct list_head *report_list;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
- struct input_dev *input_dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *input_dev;
int error;
int i;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ input_dev = hidinput->input;
+
tmff = kzalloc(sizeof(struct tmff_device), GFP_KERNEL);
if (!tmff)
return -ENOMEM;
Index: usb-devel/drivers/hid/hid-zpff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-zpff.c
+++ usb-devel/drivers/hid/hid-zpff.c
@@ -54,11 +54,17 @@ static int zpff_init(struct hid_device *
{
struct zpff_device *zpff;
struct hid_report *report;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
- struct input_dev *dev = hidinput->input;
+ struct hid_input *hidinput;
+ struct input_dev *dev;
int i, error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
for (i = 0; i < 4; i++) {
report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
if (!report)
next prev parent reply other threads:[~2019-10-03 18:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 13:29 KASAN: slab-out-of-bounds Write in ga_probe syzbot
2019-09-17 18:24 ` Alan Stern
2019-09-17 18:24 ` Alan Stern
2019-09-18 11:26 ` Andrey Konovalov
2019-09-18 12:07 ` syzbot
2019-09-19 17:05 ` Andrey Konovalov
2019-09-19 19:19 ` Alan Stern
2019-09-19 19:19 ` Alan Stern
2019-10-03 18:53 ` Alan Stern [this message]
2019-10-04 15:47 ` [PATCH] HID: Fix assumption that devices have inputs Benjamin Tissoires
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