Messages in this thread Patch in this message | | | From | Peter Hurley <> | Subject | [PATCH v2 3/9] ia64: Pin controlling tty for unaligned fault message | Date | Sun, 10 Jan 2016 20:36:10 -0800 |
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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> --- 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 622772b..e7ae608 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); -- 2.7.0
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