[PATCH 3/4] tty/serial: at91: prevent null dereference in tasklet function
From: Nicolas Ferre <hidden>
Date: 2014-01-07 10:46:25
Also in:
linux-serial, lkml, stable
Subsystem:
microchip at91 serial driver, the rest, tty layer and serial drivers · Maintainers:
Richard Genoud, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Marek Roszko <redacted> Something asks a tasklet to be scheduled when the uart port is closed. Need to supress the kernel panic for now by checking if the port is NULL or not. Signed-off-by: Marek Roszko <redacted> Acked-by: Leilei Zhao <redacted> Cc: <redacted> # v3.12 Signed-off-by: Nicolas Ferre <redacted> --- drivers/tty/serial/atmel_serial.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c421d11b3d4c..6e68486c83cb 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c@@ -1360,6 +1360,10 @@ static void atmel_tasklet_func(unsigned long data) unsigned int status; unsigned int status_change; + if(!port->state || !port->state->port.tty) + /* uart has been closed */ + return; + /* The interrupt handler does not take the lock */ spin_lock(&port->lock);
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1.8.2.2