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serial: access after NULL check in uart_flush_buffer()

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I noticed that

  static void uart_flush_buffer(struct tty_struct *tty)
  {
  	struct uart_state *state = tty->driver_data;
  	struct uart_port *port = state->port;
  	unsigned long flags;

  	/*
  	 * This means you called this function _after_ the port was
  	 * closed.  No cookie for you.
  	 */
  	if (!state || !state->info) {
  		WARN_ON(1);
  		return;
  	}

is too late for checking state != NULL.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tetsuo Handa 2008-05-06 20:42:27 -07:00 committed by Linus Torvalds
parent 3f9827bc05
commit 55d7b68996
1 changed files with 2 additions and 1 deletions
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3
drivers/serial/serial_core.c
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@ -556,7 +556,7 @@ static int uart_chars_in_buffer(struct tty_struct *tty)
static void uart_flush_buffer(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
struct uart_port *port;
unsigned long flags;
/*
@ -568,6 +568,7 @@ static void uart_flush_buffer(struct tty_struct *tty)
return;
}
port = state->port;
pr_debug("uart_flush_buffer(%d) called\n", tty->index);
spin_lock_irqsave(&port->lock, flags);