HID: Fix assumption that devices have inputs

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>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

diff --git a/drivers/hid/hid-axff.c b/drivers/hid/hid-axff.c
index 6654c15..fbe4e16 100644 (file)
--- a/drivers/hid/hid-axff.c
+++ b/drivers/hid/hid-axff.c
@@ -63,13 +63,20 @@ static int axff_init(struct hid_device *hid)
 {
        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;

diff --git a/drivers/hid/hid-dr.c b/drivers/hid/hid-dr.c
index 17e17f9..947f19f 100644 (file)
--- a/drivers/hid/hid-dr.c
+++ b/drivers/hid/hid-dr.c
@@ -75,13 +75,19 @@ static int drff_init(struct hid_device *hid)
 {
        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;

diff --git a/drivers/hid/hid-emsff.c b/drivers/hid/hid-emsff.c
index 7cd5651..c34f2e5 100644 (file)
--- a/drivers/hid/hid-emsff.c
+++ b/drivers/hid/hid-emsff.c
@@ -47,13 +47,19 @@ static int emsff_init(struct hid_device *hid)
 {
        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;

diff --git a/drivers/hid/hid-gaff.c b/drivers/hid/hid-gaff.c
index 0f95c96..ecbd399 100644 (file)
--- a/drivers/hid/hid-gaff.c
+++ b/drivers/hid/hid-gaff.c
@@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *hid)
 {
        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;

diff --git a/drivers/hid/hid-holtekff.c b/drivers/hid/hid-holtekff.c
index 10a7205..8619b80 100644 (file)
--- a/drivers/hid/hid-holtekff.c
+++ b/drivers/hid/hid-holtekff.c
@@ -124,13 +124,19 @@ static int holtekff_init(struct hid_device *hid)
 {
        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;

diff --git a/drivers/hid/hid-lg2ff.c b/drivers/hid/hid-lg2ff.c
index dd1a6c3..73d07e3 100644 (file)
--- a/drivers/hid/hid-lg2ff.c
+++ b/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)

diff --git a/drivers/hid/hid-lg3ff.c b/drivers/hid/hid-lg3ff.c
index 9ecb6fd..b7e1949 100644 (file)
--- a/drivers/hid/hid-lg3ff.c
+++ b/drivers/hid/hid-lg3ff.c
@@ -117,12 +117,19 @@ static const signed short ff3_joystick_ac[] = {
 
 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;

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 03f0220..5e6a0ce 100644 (file)
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -1253,8 +1253,8 @@ static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_produc
 
 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;

diff --git a/drivers/hid/hid-lgff.c b/drivers/hid/hid-lgff.c
index c79a6ec..aed4ddc 100644 (file)
--- a/drivers/hid/hid-lgff.c
+++ b/drivers/hid/hid-lgff.c
@@ -115,12 +115,19 @@ static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
 
 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;

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 0179f7e..1ac1ecc 100644 (file)
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -2084,8 +2084,8 @@ static void hidpp_ff_destroy(struct ff_device *ff)
 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_device *hidpp, u8 feature_index)
        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;

diff --git a/drivers/hid/hid-microsoft.c b/drivers/hid/hid-microsoft.c
index 2cf8385..2d8b589 100644 (file)
--- a/drivers/hid/hid-microsoft.c
+++ b/drivers/hid/hid-microsoft.c
@@ -328,11 +328,17 @@ static int ms_play_effect(struct input_dev *dev, void *data,
 
 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;
 

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 73c0f7a..4c6ed6e 100644 (file)
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -2254,9 +2254,15 @@ static int sony_play_effect(struct input_dev *dev, void *data,
 
 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);

diff --git a/drivers/hid/hid-tmff.c b/drivers/hid/hid-tmff.c
index bdfc5ff..90acef3 100644 (file)
--- a/drivers/hid/hid-tmff.c
+++ b/drivers/hid/hid-tmff.c
@@ -124,12 +124,18 @@ static int tmff_init(struct hid_device *hid, const signed short *ff_bits)
        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;

diff --git a/drivers/hid/hid-zpff.c b/drivers/hid/hid-zpff.c
index f90959e..3abaca0 100644 (file)
--- a/drivers/hid/hid-zpff.c
+++ b/drivers/hid/hid-zpff.c
@@ -54,11 +54,17 @@ static int zpff_init(struct hid_device *hid)
 {
        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)