From 02f14c79abe26a2045669e34baf2c8902d13ae54 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 10 Jan 2016 20:36:10 -0800 Subject: [PATCH] ia64: Pin controlling tty for unaligned fault message Prevent destruction of the controlling tty before tty_write_message() can determine if the tty is safe to use. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- arch/ia64/kernel/unaligned.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c index 622772b7fb6c..e7ae6088350a 100644 --- a/arch/ia64/kernel/unaligned.c +++ b/arch/ia64/kernel/unaligned.c @@ -1336,8 +1336,11 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs) * Don't call tty_write_message() if we're in the kernel; we might * be holding locks... */ - if (user_mode(regs)) - tty_write_message(current->signal->tty, buf); + if (user_mode(regs)) { + struct tty_struct *tty = get_current_tty(); + tty_write_message(tty, buf); + tty_kref_put(tty); + } buf[len-1] = '\0'; /* drop '\r' */ /* watch for command names containing %s */ printk(KERN_WARNING "%s", buf); -- 2.30.2