From: Peter Hurley <peter@hurleysoftware.com>
To: linux-ia64@vger.kernel.org
Subject: [RESEND][PATCH] ia64: Pin controlling tty for unaligned fault message
Date: Sun, 11 Oct 2015 00:26:01 +0000 [thread overview]
Message-ID: <1444523161-9787-1-git-send-email-peter@hurleysoftware.com> (raw)
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);
--
2.6.1
reply other threads:[~2015-10-11 0:26 UTC|newest]
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