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HID: sony: Perform CRC check on bluetooth input packets
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>
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1 changed files with 18 additions and 0 deletions
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@ -36,6 +36,8 @@
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#include <linux/list.h>
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#include <linux/idr.h>
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#include <linux/input/mt.h>
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#include <linux/crc32.h>
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#include <asm/unaligned.h>
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#include "hid-ids.h"
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@ -1021,6 +1023,7 @@ struct motion_output_report_02 {
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#define DS4_FEATURE_REPORT_0x02_SIZE 37
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#define DS4_FEATURE_REPORT_0x81_SIZE 7
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#define DS4_INPUT_REPORT_0x11_SIZE 78
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#define DS4_OUTPUT_REPORT_0x05_SIZE 32
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#define DS4_OUTPUT_REPORT_0x11_SIZE 78
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#define SIXAXIS_REPORT_0xF2_SIZE 17
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@ -1324,6 +1327,21 @@ static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
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} else if (((sc->quirks & DUALSHOCK4_CONTROLLER_USB) && rd[0] == 0x01 &&
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size == 64) || ((sc->quirks & DUALSHOCK4_CONTROLLER_BT)
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&& rd[0] == 0x11 && size == 78)) {
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if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) {
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/* CRC check */
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u8 bthdr = 0xA1;
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u32 crc;
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u32 report_crc;
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crc = crc32_le(0xFFFFFFFF, &bthdr, 1);
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crc = ~crc32_le(crc, rd, DS4_INPUT_REPORT_0x11_SIZE-4);
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report_crc = get_unaligned_le32(&rd[DS4_INPUT_REPORT_0x11_SIZE-4]);
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if (crc != report_crc) {
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hid_dbg(sc->hdev, "DualShock 4 input report's CRC check failed, received crc 0x%0x != 0x%0x\n",
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report_crc, crc);
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return -EILSEQ;
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}
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}
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dualshock4_parse_report(sc, rd, size);
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}
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