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| author | David Herrmann <dh.herrmann@gmail.com> | 2013-12-19 12:32:24 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2014-02-17 21:18:35 +0100 |
| commit | 3ccfd0a8d7062a5590923578eea829ee582beba8 (patch) | |
| tree | 5b9ef9e48ef3964b36ab103964077cd84ee45e9b /drivers/hid/hid-hyperv.c | |
| parent | a4b1b5877b514b276f0f31efe02388a9c2836728 (diff) | |
| download | linux-3ccfd0a8d7062a5590923578eea829ee582beba8.tar.gz linux-3ccfd0a8d7062a5590923578eea829ee582beba8.tar.bz2 linux-3ccfd0a8d7062a5590923578eea829ee582beba8.zip | |
HID: hyperv: make sure input buffer is big enough
We need at least HID_MAX_BUFFER_SIZE (4096) bytes as input buffer. HID
core depends on this as it requires every input report to be at least as
big as advertised.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-hyperv.c')
| -rw-r--r-- | drivers/hid/hid-hyperv.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c index 8fae6d1414cc..c24908f14934 100644 --- a/drivers/hid/hid-hyperv.c +++ b/drivers/hid/hid-hyperv.c @@ -157,6 +157,7 @@ struct mousevsc_dev { u32 report_desc_size; struct hv_input_dev_info hid_dev_info; struct hid_device *hid_device; + u8 input_buf[HID_MAX_BUFFER_SIZE]; }; @@ -256,6 +257,7 @@ static void mousevsc_on_receive(struct hv_device *device, struct synthhid_msg *hid_msg; struct mousevsc_dev *input_dev = hv_get_drvdata(device); struct synthhid_input_report *input_report; + size_t len; pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet + (packet->offset8 << 3)); @@ -300,9 +302,12 @@ static void mousevsc_on_receive(struct hv_device *device, (struct synthhid_input_report *)pipe_msg->data; if (!input_dev->init_complete) break; - hid_input_report(input_dev->hid_device, - HID_INPUT_REPORT, input_report->buffer, - input_report->header.size, 1); + + len = min(input_report->header.size, + (u32)sizeof(input_dev->input_buf)); + memcpy(input_dev->input_buf, input_report->buffer, len); + hid_input_report(input_dev->hid_device, HID_INPUT_REPORT, + input_dev->input_buf, len, 1); break; default: pr_err("unsupported hid msg type - type %d len %d", |