TTY: ntty, add one more sanity check
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>
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@ -1815,6 +1815,7 @@ do_it_again:
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/* FIXME: does n_tty_set_room need locking ? */
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n_tty_set_room(tty);
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timeout = schedule_timeout(timeout);
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BUG_ON(!tty->read_buf);
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continue;
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}
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__set_current_state(TASK_RUNNING);
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