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authorPeter Hurley <peter@hurleysoftware.com>2016-01-09 21:13:46 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-27 14:28:20 -0800
commitc8b710b3e4348119924051551b836c94835331b1 (patch)
tree5315047eaf79a1e2db862ab4502569b42b2b9136 /drivers/tty/tty_io.c
parentf4f9edcf9b5289ed96113e79fa65a7bf27ecb096 (diff)
tty: Fix ldisc leak in failed tty_init_dev()
release_tty() leaks the ldisc instance when called directly (rather than when releasing the file descriptor from tty_release()). Since tty_ldisc_release() clears tty->ldisc, releasing the ldisc instance at tty teardown if tty->ldisc is non-null is not in danger of double-releasing the ldisc. Remove deinitialize_tty_struct() now that free_tty_struct() always performs the tty_ldisc_deinit(). Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
-rw-r--r--drivers/tty/tty_io.c20
1 files changed, 3 insertions, 17 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 5cec01c75691..c9f2365167df 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -172,6 +172,7 @@ void free_tty_struct(struct tty_struct *tty)
{
if (!tty)
return;
+ tty_ldisc_deinit(tty);
put_device(tty->dev);
kfree(tty->write_buf);
tty->magic = 0xDEADDEAD;
@@ -1529,7 +1530,7 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
tty_lock(tty);
retval = tty_driver_install_tty(driver, tty);
if (retval < 0)
- goto err_deinit_tty;
+ goto err_free_tty;
if (!tty->port)
tty->port = driver->ports[idx];
@@ -1551,9 +1552,8 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
/* Return the tty locked so that it cannot vanish under the caller */
return tty;
-err_deinit_tty:
+err_free_tty:
tty_unlock(tty);
- deinitialize_tty_struct(tty);
free_tty_struct(tty);
err_module_put:
module_put(driver->owner);
@@ -3163,20 +3163,6 @@ struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
}
/**
- * deinitialize_tty_struct
- * @tty: tty to deinitialize
- *
- * This subroutine deinitializes a tty structure that has been newly
- * allocated but tty_release cannot be called on that yet.
- *
- * Locking: none - tty in question must not be exposed at this point
- */
-void deinitialize_tty_struct(struct tty_struct *tty)
-{
- tty_ldisc_deinit(tty);
-}
-
-/**
* tty_put_char - write one character to a tty
* @tty: tty
* @ch: character