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HID: sony: Perform CRC check on bluetooth input packets

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Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Roderick Colenbrander 2016-10-07 12:39:36 -07:00 committed by Jiri Kosina
parent 2c159de050
commit 49b9ca6c6c
1 changed files with 18 additions and 0 deletions
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18
drivers/hid/hid-sony.c
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@ -36,6 +36,8 @@
#include <linux/list.h>
#include <linux/idr.h>
#include <linux/input/mt.h>
#include <linux/crc32.h>
#include <asm/unaligned.h>
#include "hid-ids.h"
@ -1021,6 +1023,7 @@ struct motion_output_report_02 {
#define DS4_FEATURE_REPORT_0x02_SIZE 37
#define DS4_FEATURE_REPORT_0x81_SIZE 7
#define DS4_INPUT_REPORT_0x11_SIZE 78
#define DS4_OUTPUT_REPORT_0x05_SIZE 32
#define DS4_OUTPUT_REPORT_0x11_SIZE 78
#define SIXAXIS_REPORT_0xF2_SIZE 17
@ -1324,6 +1327,21 @@ static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
} else if (((sc->quirks & DUALSHOCK4_CONTROLLER_USB) && rd[0] == 0x01 &&
size == 64) || ((sc->quirks & DUALSHOCK4_CONTROLLER_BT)
&& rd[0] == 0x11 && size == 78)) {
if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) {
/* CRC check */
u8 bthdr = 0xA1;
u32 crc;
u32 report_crc;
crc = crc32_le(0xFFFFFFFF, &bthdr, 1);
crc = ~crc32_le(crc, rd, DS4_INPUT_REPORT_0x11_SIZE-4);
report_crc = get_unaligned_le32(&rd[DS4_INPUT_REPORT_0x11_SIZE-4]);
if (crc != report_crc) {
hid_dbg(sc->hdev, "DualShock 4 input report's CRC check failed, received crc 0x%0x != 0x%0x\n",
report_crc, crc);
return -EILSEQ;
}
}
dualshock4_parse_report(sc, rd, size);
}