HID: fix a crash in hid_report_raw_event() function.

I'm using a Data Modul EasyTouch USB multitouch controller,
which is issuing a hid report with a size equals to 0. The rsize
value gets set to 536870912 and Linux is crashing in the memset
because the value is too big.

Signed-off-by: Armando Visconti <armando.visconti@st.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 852989fc5757..84df80e3efc1 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1045,6 +1045,9 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
 
         rsize = ((report->size - 1) >> 3) + 1;
 
+        if (rsize > HID_MAX_BUFFER_SIZE)
+                rsize = HID_MAX_BUFFER_SIZE;
+
         if (csize < rsize) {
                 dbg_hid("report %d is too short, (%d < %d)\n", report->id,
                                 csize, rsize);