HID: provide a helper for validating hid reports

Many drivers need to validate the characteristics of their HID report
during initialization to avoid misusing the reports. This adds a common
helper to perform validation of the report exisitng, the field existing,
and the expected number of values within the field.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 62 insertions, 0 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ae88a97f976e..be52c06dbe30 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -801,6 +801,64 @@ int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size)
 }
 EXPORT_SYMBOL_GPL(hid_parse_report);
 
+static const char * const hid_report_names[] = {
+        "HID_INPUT_REPORT",
+        "HID_OUTPUT_REPORT",
+        "HID_FEATURE_REPORT",
+};
+/**
+ * hid_validate_values - validate existing device report's value indexes
+ *
+ * @device: hid device
+ * @type: which report type to examine
+ * @id: which report ID to examine (0 for first)
+ * @field_index: which report field to examine
+ * @report_counts: expected number of values
+ *
+ * Validate the number of values in a given field of a given report, after
+ * parsing.
+ */
+struct hid_report *hid_validate_values(struct hid_device *hid,
+                                       unsigned int type, unsigned int id,
+                                       unsigned int field_index,
+                                       unsigned int report_counts)
+{
+        struct hid_report *report;
+
+        if (type > HID_FEATURE_REPORT) {
+                hid_err(hid, "invalid HID report type %u\n", type);
+                return NULL;
+        }
+
+        if (id >= HID_MAX_IDS) {
+                hid_err(hid, "invalid HID report id %u\n", id);
+                return NULL;
+        }
+
+        /*
+         * Explicitly not using hid_get_report() here since it depends on
+         * ->numbered being checked, which may not always be the case when
+         * drivers go to access report values.
+         */
+        report = hid->report_enum[type].report_id_hash[id];
+        if (!report) {
+                hid_err(hid, "missing %s %u\n", hid_report_names[type], id);
+                return NULL;
+        }
+        if (report->maxfield <= field_index) {
+                hid_err(hid, "not enough fields in %s %u\n",
+                        hid_report_names[type], id);
+                return NULL;
+        }
+        if (report->field[field_index]->report_count < report_counts) {
+                hid_err(hid, "not enough values in %s %u field %u\n",
+                        hid_report_names[type], id, field_index);
+                return NULL;
+        }
+        return report;
+}
+EXPORT_SYMBOL_GPL(hid_validate_values);
+
 /**
  * hid_open_report - open a driver-specific device report
  *
diff --git a/include/linux/hid.h b/include/linux/hid.h
index ee1ffc5e19c9..31b9d299ef6c 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -756,6 +756,10 @@ u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags);
 struct hid_device *hid_allocate_device(void);
 struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
 int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
+struct hid_report *hid_validate_values(struct hid_device *hid,
+                                       unsigned int type, unsigned int id,
+                                       unsigned int field_index,
+                                       unsigned int report_counts);
 int hid_open_report(struct hid_device *device);
 int hid_check_keys_pressed(struct hid_device *hid);
 int hid_connect(struct hid_device *hid, unsigned int connect_mask);