diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2013-09-25 20:13:04 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-25 17:52:17 -0700 |
| commit | 5cec7bf699c61d14f0538345076480bb8c8ebfbb (patch) | |
| tree | 792107a7c2be90abd50297c9c272a7ea0aa136f6 /drivers | |
| parent | 93a8d4163ecd3fd8aac264707f1d497f193ea88d (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.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index 03ba081c5772..6fd60fece6b4 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 */ |