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authorPeter Hurley <peter@hurleysoftware.com>2013-09-25 20:13:04 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-25 17:52:17 -0700
commit5cec7bf699c61d14f0538345076480bb8c8ebfbb (patch)
tree792107a7c2be90abd50297c9c272a7ea0aa136f6 /drivers
parent93a8d4163ecd3fd8aac264707f1d497f193ea88d (diff)
tty: Fix SIGTTOU not sent with tcflush()
Commit 'e7f3880cd9b98c5bf9391ae7acdec82b75403776' tty: Fix recursive deadlock in tty_perform_flush() introduced a regression where tcflush() does not generate SIGTTOU for background process groups. Make sure ioctl(TCFLSH) calls tty_check_change() when invoked from the line discipline. Cc: stable@vger.kernel.org # v3.10+ Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/tty_ioctl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 03ba081c577..6fd60fece6b 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -1201,6 +1201,9 @@ int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
}
return 0;
case TCFLSH:
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
return __tty_perform_flush(tty, arg);
default:
/* Try the mode commands */