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TTY: ntty, add one more sanity check

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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@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2011-06-05 14:16:17 +02:00 committed by Greg Kroah-Hartman
parent 92f6fa09bd
commit 2872628680
1 changed files with 1 additions and 0 deletions
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1
drivers/tty/n_tty.c
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@ -1815,6 +1815,7 @@ do_it_again:
/* FIXME: does n_tty_set_room need locking ? */
n_tty_set_room(tty);
timeout = schedule_timeout(timeout);
BUG_ON(!tty->read_buf);
continue;
}
__set_current_state(TASK_RUNNING);