[PATCH 2/2] TTY: ntty, add one more sanoty check

From: Jiri Slaby
Date: Fri Jun 03 2011 - 09:07:11 EST

With the previous patch, we fixed another bug where read_buf was freed
while we still was in n_tty_read. We currently check whether read_buf
is NULL at the start of the function. Add one more check after we wake
up from waiting for input.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
drivers/tty/n_tty.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 95d0a9c..c62c856 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1785,6 +1785,7 @@ do_it_again:
timeout = schedule_timeout(timeout);
+ BUG_ON(!tty->read_buf);

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