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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 <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-10 20:36:10 -08:00 committed by Greg Kroah-Hartman
parent 7f71b2c144
commit 02f14c79ab
1 changed files with 5 additions and 2 deletions
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7
arch/ia64/kernel/unaligned.c
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@ -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);