Commit ee8da700 authored Mar 03, 2014 by Steven Cahail

TTY: msm_smd_tty: Fix simultaneous open/close race condition



smd_tty_close currently has a variable that depends on a race
condition with tty_port_open. This causes a null-pointer dereference
when the same port is simultaneously being opened/closed.

Use data from a static array instead of the variable to eliminate
the race condition.

CRs-Fixed: 624398
Change-Id: Ie55d37feaadd3a15f64e18501cd3af19145dbc8e
Signed-off-by: Steven Cahail <scahail@codeaurora.org>

parent cfb69012

drivers/tty/serial/msm_smd_tty.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -708,7 +708,7 @@ static int smd_tty_open(struct tty_struct tty, struct file f)

		static void smd_tty_close(struct tty_struct tty, struct file f)
		{
		struct smd_tty_info *info = tty->driver_data;
		struct smd_tty_info *info = smd_tty + tty->index;

		tty_port_close(&info->port, tty, f);
		}