[PATCH v3 01/13] serial: sandbox: Fix buffer underflow in puts

Fix the buffer underflow that would occur if puts is called with length of zero.

Fixes: efa51f2bd64 ("serial: sandbox: Implement puts") Cc: Sean Anderson sean.anderson@seco.com Cc: Simon Glass sjg@chromium.org --- drivers/serial/sandbox.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c index e726e19c46..13b54921c4 100644 --- a/drivers/serial/sandbox.c +++ b/drivers/serial/sandbox.c @@ -114,7 +114,7 @@ static ssize_t sandbox_serial_puts(struct udevice *dev, const char *s, struct sandbox_serial_priv *priv = dev_get_priv(dev); ssize_t ret;

- if (s[len - 1] == '\n') + if (len && s[len - 1] == '\n') priv->start_of_line = true;

if (sandbox_serial_enabled) {