HID: core: Provide new max_buffer_size attribute to over-ride the default

commit b1a37ed00d7908a991c1d0f18a8cba3c2aa99bdc upstream.

Presently, when a report is processed, its proposed size, provided by
the user of the API (as Report Size * Report Count) is compared against
the subsystem default HID_MAX_BUFFER_SIZE (16k).  However, some
low-level HID drivers allocate a reduced amount of memory to their
buffers (e.g. UHID only allocates UHID_DATA_MAX (4k) buffers), rending
this check inadequate in some cases.

In these circumstances, if the received report ends up being smaller
than the proposed report size, the remainder of the buffer is zeroed.
That is, the space between sizeof(csize) (size of the current report)
and the rsize (size proposed i.e. Report Size * Report Count), which can
be handled up to HID_MAX_BUFFER_SIZE (16k).  Meaning that memset()
shoots straight past the end of the buffer boundary and starts zeroing
out in-use values, often resulting in calamity.

This patch introduces a new variable into 'struct hid_ll_driver' where
individual low-level drivers can over-ride the default maximum value of
HID_MAX_BUFFER_SIZE (16k) with something more sympathetic to the
interface.

Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
[Lee: Backported to v5.10.y]
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 5f9ec1d1464a28270b649f885afe404da194e5a4..524d6d712e7248ee8452e342569f70eccd5bd5f8 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -258,6 +258,7 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign
 {
        struct hid_report *report;
        struct hid_field *field;
+       unsigned int max_buffer_size = HID_MAX_BUFFER_SIZE;
        unsigned int usages;
        unsigned int offset;
        unsigned int i;
@@ -288,8 +289,11 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign
        offset = report->size;
        report->size += parser->global.report_size * parser->global.report_count;
 
+       if (parser->device->ll_driver->max_buffer_size)
+               max_buffer_size = parser->device->ll_driver->max_buffer_size;
+
        /* Total size check: Allow for possible report index byte */
-       if (report->size > (HID_MAX_BUFFER_SIZE - 1) << 3) {
+       if (report->size > (max_buffer_size - 1) << 3) {
                hid_err(parser->device, "report is too long\n");
                return -1;
        }
@@ -1752,6 +1756,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
        struct hid_report_enum *report_enum = hid->report_enum + type;
        struct hid_report *report;
        struct hid_driver *hdrv;
+       int max_buffer_size = HID_MAX_BUFFER_SIZE;
        unsigned int a;
        u32 rsize, csize = size;
        u8 *cdata = data;
@@ -1768,10 +1773,13 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
 
        rsize = hid_compute_report_size(report);
 
-       if (report_enum->numbered && rsize >= HID_MAX_BUFFER_SIZE)
-               rsize = HID_MAX_BUFFER_SIZE - 1;
-       else if (rsize > HID_MAX_BUFFER_SIZE)
-               rsize = HID_MAX_BUFFER_SIZE;
+       if (hid->ll_driver->max_buffer_size)
+               max_buffer_size = hid->ll_driver->max_buffer_size;
+
+       if (report_enum->numbered && rsize >= max_buffer_size)
+               rsize = max_buffer_size - 1;
+       else if (rsize > max_buffer_size)
+               rsize = max_buffer_size;
 
        if (csize < rsize) {
                dbg_hid("report %d is too short, (%d < %d)\n", report->id,

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 2ba33d708942c163bb5b3d5c01c8840129f393b5..256f34f49167cb8f4827e87cc3db5e8ad3932c53 100644 (file)
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -798,6 +798,7 @@ struct hid_driver {
  * @raw_request: send raw report request to device (e.g. feature report)
  * @output_report: send output report to device
  * @idle: send idle request to device
+ * @max_buffer_size: over-ride maximum data buffer size (default: HID_MAX_BUFFER_SIZE)
  */
 struct hid_ll_driver {
        int (*start)(struct hid_device *hdev);
@@ -822,6 +823,8 @@ struct hid_ll_driver {
        int (*output_report) (struct hid_device *hdev, __u8 *buf, size_t len);
 
        int (*idle)(struct hid_device *hdev, int report, int idle, int reqtype);
+
+       unsigned int max_buffer_size;
 };
 
 extern struct hid_ll_driver i2c_hid_ll_driver;