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authorLinus Torvalds <torvalds@linux-foundation.org>2009-10-12 19:13:54 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-12 10:21:33 -0700
commiteea7e17e0eb23729d58368420659f8e7c357d82e (patch)
tree728565e8a1f01d89dda17dff00a401915378a508 /drivers/serial
parentd93a8f829fe1d2f3002f2c6ddb553d12db420412 (diff)
tty, serial: Fix race and NULL check in uart_close()
Commit 46d57a449aa1 ("serial: use tty_port pointers in the core code") contained two bugs that causes (rare) crashes: - the rename typoed one site - a NULL check was missed Reported-and-tested-by: Ingo Molnar <mingo@elte.hu> Cc: Greg KH <gregkh@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/serial_core.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 1689bda1d13b..dcc72444e8e7 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1270,6 +1270,9 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
BUG_ON(!kernel_locked());
+ if (!state)
+ return;
+
uport = state->uart_port;
port = &state->port;
@@ -1316,9 +1319,9 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
*/
if (port->flags & ASYNC_INITIALIZED) {
unsigned long flags;
- spin_lock_irqsave(&port->lock, flags);
+ spin_lock_irqsave(&uport->lock, flags);
uport->ops->stop_rx(uport);
- spin_unlock_irqrestore(&port->lock, flags);
+ spin_unlock_irqrestore(&uport->lock, flags);
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially