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Take tty_mutex when accessing ->signal->tty in selinux code. Noted by Alan Cox. Longer term, we are looking at refactoring the code to provide better encapsulation of the tty layer, but this is a simple fix that addresses the immediate bug. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Alan Cox <alan@redhat.com> Acked-by: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>