usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()

commit 517c7bf99bad3d6b9360558414aae634b7472d80 upstream.

This is writing to the first 1 - 3 bytes of "val" and then writing all
four bytes to musb_writel().  The last byte is always going to be
garbage.  Zero out the last bytes instead.

Fixes: 550a7375fe72 ("USB: Add MUSB and TUSB support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210916135737.GI25094@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index df7c9f46be548f61800b7beaa7f182b5dc447ad5..85a57385958fdd077053945e66d0103c402cdb34 100644 (file)
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -193,6 +193,7 @@ tusb_fifo_write_unaligned(void __iomem *fifo, const u8 *buf, u16 len)
        }
        if (len > 0) {
                /* Write the rest 1 - 3 bytes to FIFO */
+               val = 0;
                memcpy(&val, buf, len);
                musb_writel(fifo, 0, val);
        }