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| author | Peter Hurley <peter@hurleysoftware.com> | 2015-01-16 23:22:14 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-02 21:11:25 +0300 |
| commit | c81622ac4282b0183e738e192c91fabe4a782715 (patch) | |
| tree | 51e88cfcab3db5b04d7afb4ac1d1b51ded21b165 | |
| parent | 6ecde472b0d943251f8f348155495391720b61b0 (diff) | |
| download | linux-c81622ac4282b0183e738e192c91fabe4a782715.tar.xz | |
pty: Fix overlimit memory use
The pty_space() computation is broken; the space already consumed
in the tty buffer is not accounted for.
Use tty_buffer_set_limit(), which enforces the limit automatically.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/pty.c | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 6e1f1505f04e..f882ac81b93a 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -88,19 +88,6 @@ static void pty_unthrottle(struct tty_struct *tty) } /** - * pty_space - report space left for writing - * @to: tty we are writing into - * - * Limit the buffer space used by ptys to 8k. - */ - -static int pty_space(struct tty_struct *to) -{ - int n = tty_buffer_space_avail(to->port); - return min(n, 8192); -} - -/** * pty_write - write to a pty * @tty: the tty we write from * @buf: kernel buffer of data @@ -141,7 +128,7 @@ static int pty_write_room(struct tty_struct *tty) { if (tty->stopped) return 0; - return pty_space(tty->link); + return tty_buffer_space_avail(tty->link->port); } /** @@ -432,6 +419,8 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, o_tty->link = tty; tty_port_init(ports[0]); tty_port_init(ports[1]); + tty_buffer_set_limit(ports[0], 8192); + tty_buffer_set_limit(ports[1], 8192); o_tty->port = ports[0]; tty->port = ports[1]; o_tty->port->itty = o_tty; |