sc16is7xx: Fix TX buffer overrun caused by wrong tx fifo level read-out

We found that our sc16is7xx on spi reported a TX fifo free space value
(TXLVL_REG) of 255 ocassionally, which is obviously wrong, with a
64 byte fifo and caused a buffer overrun and a kernel crash.

To trigger this, a large write to the tty is sufficient. The fifo fills,
TXLVL_REG reads zero, but the handle_tx function does a zero-data-length
write to the TX fifo anyways through sc16is7xx_fifo_write. The next
TXLVL_REG read then yields 255, for unknown reasons. A subsequent read
is ok.

Prevent zero-data-length writes if the TX fifo is full, because they are
pointless, and because they trigger wrong TXLVL read-outs.

Furthermore, prevent a TX buffer overrun if the peripheral reports values
larger than the buffer size and thus, don't allow the peripheral to crash
the kernel.

Signed-off-by: Florian Achleitner <achleitner.florian@fronius.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index edb5305..5815bcb 100644 (file)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -389,6 +389,13 @@ static void sc16is7xx_fifo_write(struct uart_port *port, u8 to_send)
        const u8 line = sc16is7xx_line(port);
        u8 addr = (SC16IS7XX_THR_REG << SC16IS7XX_REG_SHIFT) | line;
 
+       /*
+        * Don't send zero-length data, at least on SPI it confuses the chip
+        * delivering wrong TXLVL data.
+        */
+       if (unlikely(!to_send))
+               return;
+
        regcache_cache_bypass(s->regmap, true);
        regmap_raw_write(s->regmap, addr, s->buf, to_send);
        regcache_cache_bypass(s->regmap, false);
@@ -630,6 +637,12 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
        if (likely(to_send)) {
                /* Limit to size of TX FIFO */
                txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+               if (txlen > SC16IS7XX_FIFO_SIZE) {
+                       dev_err_ratelimited(port->dev,
+                               "chip reports %d free bytes in TX fifo, but it only has %d",
+                               txlen, SC16IS7XX_FIFO_SIZE);
+                       txlen = 0;
+               }
                to_send = (to_send > txlen) ? txlen : to_send;
 
                /* Add data to send */